the difference between humans and other beings is that we decide to wage war on a single species and set out to exterminate them systematically. when coyotes eat the sheep at a ranch somewhere, the owner of the ranch doesn't just kill the trespasser but assembles his friends and sets out to kill every coyote in the vicinity. you don't see this in any other animal. like, hyenas don't go forming groups to go and hunt down all the lions in the area so they have more food to themselves. (i have read that after a lion kills a gazelle the others gazelles relax and stop running because they know the lions won't attack anymore and they can even be close to each other with no drama.) this also happens with plants; we plant rice, for example, and we take a large territory to do so. we kill off every other animals and plants around to make room for the rice and then kill any animals that may feed on it. this wrecks havoc on the complex interrelated balance of species of the area.
supposedly, animals just know. we, being sapiens sapiens, know that we know, and this allows us to think of the future and the past. i think this is a blessing/curse deal. since we think We Know What's Best and we think we can tell Good from Evil (whatever that means) we believe ourselves to be the most knowledgeable thing ever to sprout from Earth. but here we are, pillaging our resources and doubling our population every few years. like a virus. sometimes it's like we have more in common with bacteria than apes.
i don't have any theory as why this is so and i have absolutely no answer to this problem. i think we are able to be this way because we appointed ourselves a holy status by establishing humans as the god kings of the planet. and so we think we deserve to have anything and everything.