Still waiting for his secret plan to end the War. It must really piss you off to have served there. I have a friend who won't watch the series for that reason.
I think Johnson gets more blame than Nixon. As much as I disliked Nixon.
I think Kennedy should get far more blame than he does; by the time of his assassination, everything that happened under Johnson was effectively in place. You had large numbers of American advisors, a collapsing south Vietnamese government and a military/intelligence leadership that vehemently opposed just letting the south fall to the north