I think of it this way: this little “tragedy” was actually a cleanup where 3 criminals were taken off the streets.
Have it your way. It’s an even bet two stupid kids thought that nobody was home on that holiday. Looking for alcohol or something i bet. His statement indicates he sat there silently in ambush as he heard the window break.
In any case, unless i hear these two kids have held that community under a reign of abject terror, i doubt he really saved the streets from these hardened criminals.