This is a really great point. And it may not be knowable beyond what we already know.

Yikes. I mean, yes, in this sense you're right. We've never found conclusive disproof of the various conspiracy theories around the assassination and have been forced into a consensus that, y'know, Oswald shot him. But you don't believe that. And nothing is going to make you. So from you're perspective "we still don't know". WIV is going to be the same. You'll never get the disproof you demand, so you'll continue to disbelieve the consensus opinion.

Yours is a world where disproof rules, and conspiracies are assumed true until proven false. I'm sure it's entertaining, but it's not "true" any more than mine is.

In my world, Oswald probably shot JFK and covid was probably a natural virus, because those are the hypotheses that demand the least of the existing evidence. I'm willing to change my priors with more evidence, but not because of the lack of disproof of an entertaining counter-hypothesis.

More to the point— the US Government still hasn't released the classified documents that describe what happened to JFK.

I don't personally hold an opinion one way or another on JFK, but the fact is that the information on what happened still hasn't leaked out.

We also did not know that Cuba housed missles from Russia during the crisis. We also did not know to the extent that Cuba's leadership explicitly did have plans to strike the US alongside their Soviet allies.

It took until 1992 for what appears to be the truth to be discovered, 3 decades with far more people involved in the process, and a much darker outcome than a man being assassinated.

The us had credible satellite evidence of soviets building housings for nuclear warheads in Cuba during and before the crisis. https://nsarchive2.gwu.edu/nsa/cuba_mis_cri/photos.htm (perhaps I misunderstand your argument; 1992 was when our knowledge was formally confirmed, IIUC)

We did not know the missles were already physically on Cuba. We thought we had successfully blocked transport.

See McNamara's recollection of that meeting in 1992.