RFK believes "For decades, the CDC has kept a tight grip on the Vaccine Safety Datalink, concealing vital vaccine safety information from the public," - IE that CDC has conspired to conceal harmful effects of vaccines. If he finds that database, I'll gladly sit up and listen. But until he finds it I'll consider this a conspiracy theory and, according to Psychology Today, belief in conspiracy theories is not necessarily associated with mental disorders.
I disagree with a lot of people in the Trump administration, but I only use the word insane (in the subjective sense, not in the literally diagnosed sense) to describe RFKJr.
I don't give him credit because he comes to his view from a lot of dangerous mistrust of science and medicine. I know a lot of people at CDC who work on flu vaccines and AIDs research, and my step-father was on the team that eradicated smallpox. RFKJr has done unimaginable harm to public health and is pushing us backwards. The people at CDC genuinely want to help people. You can say they've done things wrong, overstepped in some way, or have too much research money from private industry, and that could be a good discussion. No group is perfect, but the answer isn't to destroy it all, or think the CDC is part of a conspiracy.
I think food dyes need more research and better understanding before deploying to millions of people, that is not the same as his anti-science stance. While breaking a lot of things, he also happened to do something good, I don't think that counts as "solving the actual problem".
And, as far as your last point about previous administrations I meant both democrat and republican, but it's been obvious a long time that Democrats pandering would cause a backlash.
At any rate, I don't discount peoples ideas as brainwashing or preconceived ideas, even people I disagree with. I want America to succeed. Trump even did a few things in his first term I agreed with. You seem to have a filter to think people who don't buy into this "new golden age" are brainwashed or tribal. This isn't true. Spend some time considering other view points.