They shouldn't blame this on PTSD. 99.99% of people with PTSD would never think of killing children.
That's probably true, Ravi; but with PTSD (and some cases of TBI) there's always the unpredictable. If someone had a really vivid, dissociative flashback while in a combat zone, I wouldn't rule out the possibility. Flashbacks themselves are unpredictable; they can be brief, or go on for hours, and involve anything from visual hallucinations one knows aren't real, to a break from reality where one feels as if one is literally right back in the midst of the event, complete with sights , sounds and even smells. In that sort of instance an individual can become completely irrational, even physically violent.PTSD, for anyone who gets it, is no laughing matter; it can usually be treated, with excellent success, but when it isn't , it can lead to irrational acts . The usual worst consequence is suicide, but there have been cases where it led to homicides, especially of family members.
There is always some risk of a troop having an actual psychotic episode as a result of continued or repeated exposure to combat, in which case all bets are off, as to what such an individual may do. That is comparatively rare; but it can and does happen. Usually, just as in the civilian world, this is preceded by behavioral warning signs, but not always.
I can tell you from personal experience that ground combat is a mind-shattering experience, one from which few people emerge emotionally unscathed.The individual threshold for profound psychological damage is not predictable to begin with, and service members are now often exposed to deployment and an operational tempo far beyond what we know damaged many troops in Vietnam. How much is too much? We don't precisely know, but we do know that PTSD and suicide among both active duty and recently discharged personnel have spiked dramatically in the last few years, which would suggest that more and more of them are simply being pushed past their limits. It would not surprise me, if we were to see more cases of combat-related psychosis under those conditions.