Can't that be said for everything?
Tigers doesn't either. Humans can eat their pray?
Small snakes can be replaced with .. owls?
And so on.
So why bother.
Same could be said about Christians, Muslims, Americans, French people, vacuum cleaner sellers, McD personal, .. too. Just kill them and let other humans replace them. Why not?
Guess it doesn't matter that all the extinct animals died because obviously the world carries on anyway.
Just destroy everything. WTF. Something else will replace it eventually. And really our existance is pretty useless anyway and the Earth will be destroyed and all life on it eventually anyway so why bother?