Good question.

I sometimes think about the fact that JFK fired Alan Dulles, the guy in charge of assassinating world leaders, months before he was assassinated, and that Dulles was then on the investigative committee into his death. Now, does that prove Dulles was behind the assassination? No. But it does make me go "Hmm." But it is worth noting that if that was what happened, I certainly wouldn't have the means at my disposal to prove it. I wasn't on the investigative committee, after all.

Now, I might choose to believe that's what happened, or that there was a possibility that that's what happened. You might not. That's fine. But what would be less fine would be if I declared anyone who doubted my conjecture and wanted concrete proof to be a redfash who blindly believes anything the US government says and should be banned and excluded from conversation.