Big cats have hunting instincts that are hard to turn off even if they like you (see: any news story of a big cat eating their owner), humans have instincts relating to forming communities. every single species has some instincts they follow and they aren’t the same as ours, they’ll deeply shape how a species’ cultures/morals/etc develop. Just saying goblins are little green humans is deeply boring and hurts world building.
And will try to reduce you to pebbles soon, or something similar.