Any of those explanations make more sense than saying it was a Muslim plot (not that that’s saying much). All I’m saying is that if you like to think about who could have been behind the shootings (other than a random nut) the Kennedy’s left plenty of people with motive and ability.
Sirhan was in prison and he asked the other inmates if they could steal a pound of something, what would it be? They answered diamonds, gold, valuables.
He answered weapons grade plutonium.