The comparison with French soldiers who had fought in Algeria is, in my opinion, more relevant. As for the American veterans, they were ignored after they returned from the war.It was discovered only decades after the end of the war that a huge number of them had been suffering of PTSD, although there was no name for it in French until recently. In fact, many of them were still suffering after thirty years and are probably still suffering.

As far as I know, there is no record of a significant number of crimes committed by Algeria veterans (it would require some research).

"Ne te courbe que pour aimer..." René Char