What Bill and others can do is speculate that the CIA killed JFK. Or the Pentagon. Or the FBI. Or Wall Street bankers. Or Texas oilmen.
We can speculate about all sorts of hairbrained conspiracy theories involving all sorts of institutions and figures and persons and forces. Hell, we can speculate about aliens (that is one theory). It's done here nearly every day. Tens of thousands of such posts. All sort of oddball claims and allegations.
And the skeptics here who lecture against "speculation" will not say a word about this. Not one. But speculating based on facts about Oswald's motives? That's simply not allowed.
And they think they are convincing people that they really aren't conspiracy believers. Yes they do.
Speculation about historic events is perfectly normal. Individuals can observe the same historic facts and reach different conclusions or interpretations of the facts. There are few historic events that have 100% consensus among historians and researchers.
Only the LN crowd within the JFK research community tries to discourage people from speculation about the JFK assassination.
I think it's perfectly fine to debate Oswald's motives but at the end of the day, only Oswald knows what he was thinking or feeling on 11/22/63 and all we can do is speculate because he was killed soon after.
I'm of the opinion that there was likely a conspiracy but I'm undecided on what role Oswald played in it. If he was involved, I admit that I don't know what would've motivated him.