Yes.

So every statement should always be taken seriously? Is there no minimum bar of credibility that should be met?

Credibility is not only about who says it, but at least a bit about what they say, right?

If McAfee said the moon is made of cheese, I’d call that less credible than McAfee saying he’s going to get suicided.

Right, it's about both. "The US government is gonna suicide me" is not a statement I would believe coming from the average person, and given McAfee's statements/claims/drug abuse/tax evasion/etc I would say he had less credibility than the average person.

Unless you are very sure that McAfee was "clearly unhinged individual", it is a strong statement and ad hominem. Doesn't help add to the discussion than mere gossip.

The man said he would eat his own dick on TV[1] if Bitcoin didn't hit $500k in 2020. There are credible reports he paid women to shit in his mouth from a hammock. There is his entire twitter feed. I am very sure McAfee was a "clearly unhinged individual", and if you're not I'd like to know what kind of evidence you need.

[1] http://dickening.com/

We don't have to go any further than the tweet that started this thread: McAfee claimed to be "getting subtle messages" from officials in the American government threatening to kill him.

He was a clearly unhinged individual.

Nice circular logic.