It is a sign of how twisted the law has become that each of these common sense rulings was by a narrow 5 to 4 majority. While the 1995 case involved a federal law against carrying a gun within a certain distance of a school, this year's case involved a woman suing two men for rape under a federal law. Neither case was about whether the law was good or bad. The feds have been getting around the Constitutional limits by claiming to be regulating interstate commerce. But the Supreme Court didn't buy it.
Rape is already illegal in every state.
State courts have the power to do everything up to and including executing people, so sending a case to a state court is no wrist slap. It matters because a concentration of power is dangerous. The familiar division of federal power among the President, the Congress and the Supreme Court was just the beginning. The Constitution also made it possible to impeach anybody who abused his power. In addition, the crucial 10th Amendment to the Constitution said that the federal government had the power to do only what it was specifically authorized to do, while the people or the states could do whatever they were not specifically forbidden to do.