In some of his personal behaviour Johnson did have problems, but in his legislative deal making he was unsurpassed. Your point about Vietnam is excellent. Documentaries suggest Johnson felt really hung with it. There's a lot of blame to go around on Vietnam including Generals who incompetently didn't realize what they were dealing with and who gave dreadful advice and false hope. The nonsense of the domino theory was the big motivator. Johnson could have pulled the plug on it but he surely wasn't getting good advice. I think it was a great tragedy it finished him as President, and a tragedy in soooo many other ways.