The protagonists in the Old Testament do exactly that more than once with less provocation, and millions of people still consider them the good guys. Israel’s PM in particular has specifically cited one of them as a model to emulate. Look up his comment about Amalek.
So yes, a lot of people would do that, and the people in charge of this massacre in particular would definitely do that given a chance. Or, you know, you can look at the fact that they basically are doing that right now, just with bombs rather than small arms.