You wonder what would have happened if the Kennedys had spent as much time working to overthrow or assassinate Ho.
Ho had no fear off being overthrown. Kennedy and Johnson both decided to only fight a limited, defensive war avoiding the mass casualties of WWII and leaving the North off limits to invasion. A “Strategy for Defeat” as Admiral US Grant Sharpe titled it in his memoir.
The initiative and pace of the war was entirely up to Ho and Giap and they simply had to wait for us to tire of it.