That's a matter of definition. Since there is no scientific meaning to the term "snapping" there is no expert opinion to be had on the matter. What is well known and beyond dispute scientifically is that there is a response continuum from thought to action which is subject to, amomg other things, arousal("stress") level.
It is a virtual 100% finding, for example, that incidents of domestic violence are preceded by escalation of verbal conflict. After a certain point, someone goes into physical action and hurts someone. Can that be described as 'snapping?' It can be if you want it to, because the word means only whatever you want it to mean. In this case it has been reported that a lengthy argument preceded the shooting. Did the argument lead to a "snap?" Who knows. I have known combat veterans who "snapped" and won serious decorations because they took it out on the enemy.
The point is that people can act in unpredictable ways under an extreme stress level, and often do. You can like it or not but it's a fact of life.
My point is that nobody ‘just snaps’. Thats a time honored myth thats been debunked by experts for years.
That’s a matter of definition.
No, actually it isn’t.