I agree with both of you, Corky and Emmanuel. 

Vietnam vets were sacrificed needlessly and many came home deeply traumatized. It saddens me, and no doubt this fellow is only angrier about having served his country and now his government is attacking him. Since he isn't rational, he isn't likely to understand his part in it. 

I have to admit, I can understand why someone on the edge would be driven over it with all the various ways we the people have lost control of our own local, state, and federal governments so that their agencies no longer serve us like they are supposed to. So much ongoing anger, disappointment, fear, and stress is hard for all of us so imagine what it does to those who are mentally unstable? 

But also, like Emmanuel said, it is a myth that Vietnam war vets returned home to an unsupportive country. They came home disillusioned with their government and angry, but that was from the war, not because people at home did not support them.