Sorry, you already answered the US Government question. Tonkin Gulf could be true, I don't know enough to be certain either way. JFK, no. The rest you list, I don't know. Allende, quite possibly. Castro assassination, looks reasonable though stupid. Pearl Harbor/FDR, not in a million years, it's just too stupid a premise and all the evidence is against it. Churchill/Coventry, possible but not reasonable in the light of the evidence, I don't believe it. Iran/Contra, yes, quite plausible. Reichstag, looks like no despite the awfulness of the supposed culprit. Chemtrails, don't be stupid. Moon landings, ditto. Watergate... no, just yanking your chain.
Bottom line, I'll believe it if the evidence says yes, I'll believe it could be true if there's virtually no evidence, I'll disbelieve it if the evidence says no. 9-11, the evidence doesn't just say no, it says
NO!
Dave