When JFK was whacked, his Secret Service people had the foreknowledge to stay out of the way of incoming bullets. RFK's security detail pushed him into a kill zone, and were on an extremely short list of people close enough to have done the deed.
RFK Jr. should take the sensible solution of backing Trump. At least Trump doesn't believe in political assassinations.
If RFK Jr. wants to go it alone, he should try full body armor and see if the popemobile is for rent.