I'm aware, but there's also animals that we kill and eat for food.

[He's not happy about the monsters in the forest either, but to disturb someone's hunting grounds... it makes him angry. Traditions, years of experience have taught him the importance of hunting grounds and what to do when you cross into someone else's.]

[The answer is 'don't fuck with it'. Which is what Dabi's doing right now. His ears flick backwards and his tail lashes angrily. He can control his anger, but Dabi's crossed a line. The other probably doesn't care but also doesn't know he crossed a line, which is what's keeping him calm. For now.]

Also I don't think those monsters are capable of fear. They're too far gone. So you're just destroying the forest for pointless reasons.