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.
I didn't intend to claim anything about how the brain or human intelligence works. Rather, I'm saying probability theory points at a correct way to reason for ideal agents, which humans can try to approximate. I expect approximations which involve thinking explicitly in terms of probabilities (not necessarily only in terms of probabilities) will tend to outperform approximations that don't.
Anyway, back to the object level: I would welcome more evidence on the question of aliens, but I personally don't feel that confused by current observations, and believe they are well-explained by higher prior probability hypotheses that do not involve aliens.
Perhaps the reason this post received some downvotes: it reads somewhat as a call for others to do expensive investigatory work and / or deductive thinking. Personally, I feel I've already done enough investigation and deduction on my own on this topic, and more (by myself or others) is probably not worth the effort.
Note, there's sometimes a tradeoff between gathering more facts and thinking longer to deduce more from the facts you already have. In this case, I think there's already more than enough evidence available for an ideal agent to conclude from a cursory inspection that the observed evidence is not well-explained by actual aliens. But you don't need to be an ideal agent to draw similar conclusions: you merely need to apply some effort and reasoning skills which are pretty common among LW readers, but not so common outside these circles (some of the skills I have in mind are those described by the bullet points in my reply here.)