Though it is also highly notable that he publicly posted "I'm not going to kill myself, and if I do then I was probably assassinated" before his death.
Also, what benefit is there to the US to kill him? They already won. Being able to kill people you have custody of is a weak message compared to "nowhere is safe from us".
He killed himself to damage the reputation of the US government.
He couldn't escape from imprisonment, and he couldn't do much to harm the government. But he could do this.
It was the most he could do, so (I think) it's what he did.
Really, honestly, seriously. Have you even tried to consider it could be that way around? Occam's razor suggests -- no, it screams! -- that he killed himself:
* People get desperate and kill themselves in some situations. McAfee was in a typical such situation.
* Having killed himself -- or not, as some would have it -- at the moment McAfee is big news. People (such as yourself) are (literally) screeching bloody murder. If there is anything to find, investigative journalists now have lots of incentive to look for it. If he'd just been extradited, probably no one would have cared; there might have been a few short articles noting the fact, and that would be that. Wouldn't it be stupid, then, to kill him since that would only attract all this attention (that you and I are lavishing on it)? How plausible is it that any actor that has the resources to have someone "whacked" is that stupid?
* Lots of people (you possibly among them?) have suggested that he was killed because "they wanted him silenced". I have asked a few what, exactly he is supposed to have had on anyone that would warrant "silencing" him. So far nobody has had any suggestions. Do you?
So, yeah, it does indeed look like some are doing their best to avoid facing the truth: You all who see a conspiracy here.
More to your point -- replacing one weakly substantiated theory with another -- there are still degrees of plausibility among unsubstantiated theories.
He's also indicated much more recently that any "suicide" wouldn't be such.
what's the optimal cooldown to post affirmations of life so that you believe they're true?
Instead of trying to look for evidence in someone's tweets, how about we look at the facts on the ground. Such as: was he on suicide watch? Is this jail reliable? Is there a history of conspiracy and/or corruption in this jailhouse?