Why is killing a human very wrong, killing a dog sort of wrong, and killing cows, pigs and insects done with impunity and on an industrial scale?
Do cockroachs, as a species, have a right to exist?
What gives you the right to exist?

Do cockroachs, as a species, have a right to exist?
Do humans, as a species, have a right to exist?
What gives you the right to exist?