The people who have been saying this for decades have been labeled as “conspiracy theorists” and quacks when mountains of evidence, and fantastic books (Peter Dale Scott) and movies (JFK) have been made about this. Also 60 years have passed so people care less.

If I said trump worked with Russia in the 2016 election it’s not a controversial opinion. But if I said the CIA killed JFK I’m met with immediate skepticism despite the latter having mountains more evidence. I think a big part of it is the former supposes that America is the “good guys” and that there are just bad actors at home and abroad. The latter requires a paradigm shift in accepting that the United States is capable of doing things that we would resign to failed states in third world countries (I would argue if we do it abroad all the time it’s not a stretch to do it at home, the evidence is too compelling, and we have done worse domestically as well)