I've yet to see proof of Epstein's suicide. It may be true, it may not be true, likely we will never know. A proper conspiracy about it does not just state that there is a possibility that Epstein committed suicide, it will also include who did it and why.

As for the MKUltra stuff: the whole crux of a good conspiracy theory is that it is rooted in some real world event and then puts a crazy spin on it. People probably don't even realize when they step off the cliff of reason into the world of the nut cases.