Comments of chapter undefined of Supreme Lord: I can extract everything!

I thought of this as a possible reason but more than likely, it's because they're afraid of retaliation. They might have felt/seen his power when he went on a rampage because of the cursed marks. After all it says some of the beasts fighting together right now are usually enemies, and they all adhere to the rules of the jungle so just because one adheres to the rules of the jungle doesn't mean they're exempt from being hunted