Doesn't even matter to me whether or not someone believes non-human intelligence are real. The facts are, pilots are seeing craft able to do things that go against all known laws of physics whilst out in training exercises. There has been multi decades of stigma and intimidation surrounding this topic. You don't have to believe Grusch but I absolutely believe Fravor and Graves that at the very least, there is unknown craft operating in American airspace that is capable of doing maneuvers we're not currently capable of doing.
If Grusch is telling the truth and I assume he is, he seems too much of a policy, by the book nerd if you heard him reference multiple times policy and law when giving answers. The non-human intelligence part is somewhat scary but the fact there is possibly a shadow, rogue element in the government that has seemingly worked tirelessly to evade oversight by elected congressmen/women and has been under oath accused of possibly murdering people to keep said stuff a secret. Grusch, admitting to name names in a private secure session and the details of program names and people running them. I don't know, thats more scary to me because we don't know what the motivations are of a non-human intelligence are nor where they come from.
If Grusch is this crazy person who is full of crap, why all the stonewalling then? Members of congress tried to secure a SCIF before the hearing to get more details from Grusch and were denied.