Many of your family relatives, and possibly even you, are on Medicare, disability, or benefiting from another of the myriad domestic programs LBJ put into place.
That is one measure of his importance and legacy: we are still in some sense very much living in the world LBJ built.
As to Vietnam, it doesn't pass the laugh test that conservatives are posturing as the resolute Vietnam war opponents.
Until about ten years ago, message board conservatives almost to a man thought we should have stayed in Vietnam fighting to the bitter end, and they blamed the dirty hippies for forcing our troops to come home.