Think about your assertion:
The government carries off 3 high profile hits with each implication only going one person deep?
No, this was Mafia work.
They’re much more capable of cleaning up trails of dirty laundry than the government.
The Kennedys had ties to both the mafia and the government. I still say our government had the complete means of covering this up. The others may be involved; but the government is the only one that could carry the coverup out.