Epistemic status: Big if true/I am clearly an idiot for even posting this.
Some apparently real journalists have been approached by (& approached) several intelligence officials, some tasked specifically with investigating UFOs, who claim that the DoD has had evidence of alien intervention for a while in the form of partial & mostly-whole fragments of alien aircraft. A followup article where the publication outlines how the editors verified this persons' and others' claims and affiliations is here, and a part 2 is expected tomorrow.
For some reason - very possibly because it's complete nonsense, or because they haven't had time to independently verify - the story has only been picked up by NYMag so far. The consensus among the people I've been reviewing this article with, is that it's either a complete hoax (i.e., the entire thing nearly top to bottom is some deliberate deception) or there's a non-negligible (>5%) chance aliens are here. I would love for someone who has a good understanding of the material to give an explanation (including possibly on priors, just thinking clearly about the content of the article) of why my friend group should discount this out of hand.
Thus far I have been unconvinced by most stories of why we should to-the-point-of-not-caring-about-UFO-sightings-expect Aliens have to be big and obvious and tile the universe with fun, as opposed to operating some sort of noninterventionist monitored lightcone.
The thing that has to be explained is why serious intelligence professionals speak of likely non-human origin.
It's either:
(1) The US military/intelligence community is made up of people who are really crazy.
(2) There are actual aliens
(3) It's a strange disinformation campaign that seems to go counter to the core interests of the military/intelligence community. It's damaging to public and congressional trust in the military and invites oversight.
(4) There are some really strange turf wars going on in the military/intelligence community.
(5) There's some other secret that's even more strange to be covered up like psychic powers being responsible for the observed objects.
None of the explanations passes the smell test.