I can argue both ways. The mafia was not known for killing public figures and politicians.
On th other hand the Kennedy’s were persecuting them as far as they were concerned and Giancana was worried about jail.
Why kill Bobby when he reported to JFK? If you kill JFK yogurt back at the guy you helped get elected and LBJ would not keep Bobby around.
A lot of people had the motivation to kill; JFK.
I’ll go with the evidence. I have seen no compelling evidence to convince me Oswald was not acting alone.