A common response in the recent LessWrong threads about UFO's is rationalists immediately going into a state of wanting to translate the news into probabilities of the existence of aliens instead of taking the facts for what they are and thinking about what should happen based on the revealed facts.
According to Ross Coulthart, David Grusch gave the ICIG, Congress and the Senate, the location where the vehicles are stored and the names of the people who control access to those programs.
While I would like to know whether or not aliens visited earth, I think it's more useful to simply take the stance "I don't know" instead of thinking in terms of probability.
From the "I don't know"-stance, the next step is obvious: There need to be congressional hearings where the people who were named has being in control of access to those programs get asked in public about the nature of those programs.
Given that there seem to be powerful people in the intelligence community who want to block public exposure of whatever the nature of those programs are, it's important that there's public pressure on Congress to investigate and hold public hearings that go into the details.
The mental moves of directly rounding down to "my priors against aliens are high" -> "no aliens" -> "no need to do anything" is bad as if enough people hold it we won't get more evidence.
From the point of view of a decision maker in the government, sure, I agree. From my viewpoint it makes little difference; if it's just some random crazy guy, it's not worth explaining, and if it's a conspiracy of some sort to forge this information for NatSec purposes, then odds are the committee would end up bending over to it or being fooled as well. Either way, I'm not going to know anything for sure until there's some actual disclosure of some actual things that can't be explained in any other ways than aliens or an equally extraordinary phenomenon. Until then, it's a non-issue for me; it's neither actionable nor verifiable, so ignoring it makes perfect sense.