It's probably because most humans can't talk to Pokémon. If they could, they'd understand why some Pokémon attack humans.

I've never thought of humans using nonliving things being like eating them. But if we treat them like we are, then maybe we wouldn't need to mine as much-

[He senses hostility and stops walking, extending an arm to give a "stop" gesture to those behind him.]

Someone's coming.

((Go ahead, Wighty!))