Well, the My Lais were an infinitesimal percentage of what happened in Vietnam. And even that event had a reason. But people never in uniform probably have never researched it enough to understand the situation.
The problem is that if you do not have combat experience, you are unlikely to be able to interpret properly the events reported. It's like the anti-gunners imagining blood in the streets if we let common people carry a gun. But it never happens. Reports from the battlefield have the non-combat folks imagining all sorts of horrors. There are horrors, but they are not the ones the public imagines from the anti-war liberal "reporters."
BTW, My last combat wound was actually in Cambodia. Come over and I'll show it to you. I'll even let you kiss it. It was a Forrest Gump wound.