Listen to the Johnson tapes from 1964. He sounds like a libertarian peacenik and warns presciently about the dangers of a ground war...yet he did it anyway. Talk is cheap, especially from a politician. The hard reality is that the warmonger, statist playboy Kennedy dramatically increased advisers, many of whom had combat roles. There is every reason to believe from his actions that he was headed down the same road as LBJ.
Also, let me remind you, that Kennedy gave a green light to the MURDER of Diem, only a month before his assassination. Some libertarian hero!