To copy a couple of my own comments from elsewhere:
and
[T]he thing is the state usually doesn't need to whack them. Why would the US have had McAfee killed; what would be gained from it that couldn't just as well be gained from letting him rot in jail, be it in Spain or the US? And please don't try the old "to silence him / suppress the Secret Truths he knew!". A) The null hypothesis is that there are no such "Secret Truths"; and B) if anything, this "suspicious" death lends more weight, not less, to his deluded ravings. (As witnessed by much of this comment thread.)
and
How many people in high places -- billionaires and top politicians -- had hung out with McAfee, on his yacht possibly sticking their dicks where they shouldn't have stuck them? Feels much, much more plausible that Epstein was silenced than that McAfee would have been. At least AFAICR I haven't seen any even remotely credible reason why anyone would have needed McAfee silenced.