Sad to see, no doubt there are underlying problems that have caused this guy to go a bit wild, and the Forces should do all they can to help him.
May well have been the issue, though at the end of the day only one person knows why he did it and regardless of that fact, I wish him well in his future, he has at least earned that and my respect for his service up to this sad incident.
Personally never tried any drugs and never wanted too, my life satisfies me as it is without any chemical assistance, well bar the odd wine and beer.