Answer the question at the end by quoting:

The third of five children, Allen was born at Castle Air Force Base near Merced, California, the son of Walter Sr. and Flora Allen. A military child, he spent time growing up in Saxmundham in England, Altus in Oklahoma, Edwards Air Force Base in California, and Germany. After years of traveling and constant moving, he moved to Dalzell, South Carolina where he would attend high school for the next four years. When he first arrived, he was always the odd man out that kids often picked on for his formative language that he used due to his elementary years in Britain.
Allen rejected a two-year, $12 million offer to return to the Boston Celtics and accepted a three-year deal with the Miami Heat, who were limited to their mid-level exception amount of slightly more than $3 million per season. During Allen's first season with the Miami Heat, he averaged 10.9 points per game and made 88.6% of his free throws while playing an average of 25.8 minutes per game. On April 25, 2013, while playing Milwaukee in Game 3 of the first round of the playoffs, Allen made his 322nd career three-pointer in the playoffs, which broke Reggie Miller's record for most three-pointers made in NBA playoff history. Allen returned to his favorite #34 jersey upon joining the Heat. In Game 6 of the NBA Finals against the San Antonio Spurs, as the Heat trailed by three points, Allen made a game-tying 3-pointer with 5.2 seconds left in the fourth quarter. Having rallied from a 10-point deficit at the end of the third quarter, the Heat won in overtime 103-100 over the San Antonio Spurs and forced a seventh game in the series. With the Heat leading 101-100, Allen stole the ball from Manu Ginobili under the Spurs' basket and drew a foul with 1.9 seconds remaining in the overtime period. Allen made both ensuing free throws to put Miami up 103-100. Allen played 41 minutes in Game 6 off the bench and scored 9 points on 3-for-8 field goal shooting; his game-tying three-pointer was the only three-pointer he made in three attempts. Allen also had one defensive rebound and two assists. In Game 7, which the Heat won 95-88 to win its second consecutive championship, Allen played 20 minutes off the bench. Although he made none of 4 field goal attempts and had 3 turnovers, Allen recorded 4 defensive rebounds and 4 assists. On June 29, 2013, Allen picked up his $3.23 million player option to stay with the Heat through the 2013-14 NBA season. During the regular season, Allen played in 73 games, starting 9 of them, averaging 9.6 points and shooting 37 percent from three point range. In the playoffs, Allen scored 19 points on 4-7 three point shooting in game 4 of the conference semifinals against the Brooklyn Nets. Then in Game 3 against the Indiana Pacers in an Eastern Conference Finals rematch, Allen hit four 3-point shots in the fourth quarter and put them up 2-1 in the series. The Heat won the series in six games to advance to the NBA Finals for the fourth straight year and Allen's second. The Heat faced the Spurs again in the 2014 NBA Finals, but they lost the series in five games.

Did he do well playing for them?

broke Reggie Miller's record for most three-pointers made in NBA playoff history.

Answer the question at the end by quoting:

Maurice Robert "Mike" Gravel (; born May 13, 1930) is an American politician who was a Democratic United States Senator from Alaska from 1969 to 1981 and a candidate in the 2008 U.S. presidential election. Born and raised in Springfield, Massachusetts, by French-Canadian immigrant parents, Gravel served in the U.S. Army in West Germany, and he later graduated from the Columbia University School of General Studies. He moved to Alaska in the late 1950s, becoming a real estate developer and entering politics. He served in the Alaska House of Representatives from 1963 to 1966 and also became Speaker of the Alaska House.
In the late 1960s and early 1970s the U.S. Department of Defense was in the process of performing tests for the nuclear warhead for the Spartan anti-ballistic missile. Two tests, the "Milrow" and "Cannikin" tests, were planned, involving the detonation of nuclear bombs under Amchitka Island in Alaska. The Milrow test would be a one megaton calibration exercise for the second, and larger five megaton, Cannikin test, which would measure the effectiveness of the warhead. Gravel opposed the tests in Congress. Before the Milrow test took place in October 1969, he wrote that there were significant risks of earthquakes and other adverse consequences, and called for an independent national commission on nuclear and seismic safety to be created; he then made a personal appeal to President Nixon to stop the test. After Milrow was conducted, there was continued pressure on the part of environmental groups against going forward with the larger Cannikin test, while the Federation of American Scientists claimed that the warhead being tested was already obsolete. In May 1971, Gravel sent a letter to U.S. Atomic Energy Commission hearings held in Anchorage, in which he said the risk of the test was not worth taking. Eventually a group not involving Gravel took the case to the U.S. Supreme Court, which declined to issue an injunction against it, and the Cannikin test took place as scheduled in November 1971. Gravel had failed to stop the tests (notwithstanding his later claims during his 2008 presidential campaign). Nuclear power was considered an environmentally clean alternative for the commercial generation of electricity and was part of a popular national policy for the peaceful use of atomic energy in the 1950s and 1960s. Gravel publicly opposed this policy; besides the dangers of nuclear testing, he was a vocal critic of the Atomic Energy Commission, which oversaw American nuclear efforts, and of the powerful United States Congress Joint Committee on Atomic Energy, which had a stranglehold on nuclear policy and which Gravel tried to circumvent. In 1971, Gravel sponsored a bill to impose a moratorium on nuclear power plant construction and to make power utilities liable for any nuclear accidents; in 1975, he was still proposing similar moratoriums. By 1974, Gravel was allied with Ralph Nader's organization in opposing nuclear power. Six months before U.S. Secretary of State Henry Kissinger's secret mission to the People's Republic of China (P.R.C.) in July 1971, Gravel introduced legislation to recognize and normalize relations with China, including a proposal for unity talks between the P.R.C. and the Republic of China (Taiwan) regarding the Chinese seat on the U.N. Security Council. Gravel reiterated his position in favor of recognition, with four other senators in agreement, during Senate hearings in June 1971.

What were his reasons for opposing it ?
he said the risk of the test was not worth taking.