I'm sure others here have probably seen the same documentary about WWI and the shell shock cases where men went completely insane. There was one vet who had just passed away in the 1990's and he shook violently and uncontrollably his entire lifetime.
There are horrors in all wars that vets carry with them their entire lives. The big difference about Vietnam vets and vets from all other U.S. wars is how horrible they were treated after they returned home in the late 60's and 70's. I think it's one of the most despicable and tragic things I've known in my lifetime. Completely and utterly despicable that a whole part of the American society would behave like they did.
It's just unimaginable to me and I was just a kid at that time but remember it vividly. It's only been relatively just recently that Vietnam vets have been treated with the honor they deserved 40 years ago.