They reckon the probability of neighboring intelligent life as next to nil. While the latter is true, as most parents of young children can tell you, it is of little interest to busy scientists. It's myth, entertainment, and fairy tale, and none of their business. The point is reinforced by the evident ease with which aliens violate every physical law. There is not one single piece of physical evidence that even a preponderance of believers will accept.
Government largely shares the scientists' attitude.
The Defense establishment in particular is perfectly happy with the scientific paradigm. It spelled out a variety of threats posed by contact with a more advanced civilization. The report acknowledged that greater unity might result, but they noted the greater historical likelihood of social collapse in such a situation. Besides, the knowledge would contradict religious dogma in nearly every faith, and would challenge the primacy of science as well. Every portion of the establishment, except possibly the media, would suffer an irremediable blow to its own prestige and power in such a case.