@Claresilver47 I never said anything about justified. I just said that the MC would probably have done the same if he was, say a 'Fist Saint' and found a dangerous monster in the vicinity of a kid, without any knowledge about the situation. AKA he would have punched it and killed it in one hit, but the tamer would be unable to get revenge on him due to how overpowered he is.
I doubt he would even hesitate much given that adventurers kill these for a living all the time.
@Boomburst Refer to the above answer. It doesn't help that Monster Tamers seem to be a SUPER rare class, that situation was more like a hunter seeing someone messing around with a wild and dangerous beast, shooting it and then finding out it was actually their pet.
Btw, the one who killed the monster wasn't the one who threatened em', in fact he even asked his party if they were being serious and then asked the villagers to calm down.