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These are political assassinations but they are assassinations by crazies.Some of them, we don't know who did them at all (e.g. MLK).
But even if that was the case, it's not difficult to manipulate a "crazy" to do something, especially if you have both crazies and guns in abundance in a country.
It would be a nice way to avoid blame for the whole thing, and you can even have some mafia figure/ex-cop collaborator kill them afterwards, before said crazies ever get to go to trial for the first murder.
>you have to come up with some evidence otherwise it's just conspiracy theorizing
You think there's much evidence in e.g. banana republic political murders too, even those where still everybody knows the government or some mogul with special interests ordered them?