Locusts don't die out though, they just consume enough resources that they can't sustain their numbers, and their population sees a vast drop.

I would much rather humans learned how to utilize resources in a much more stable manner, bit given the option of humans as locusts that strip-mine planets or humans as a species that used to exist until they died out, I'll take the former every time. As long as we exist, so does the possibility we'll change. But I would support us doing what we need to survive as a species even if I knew we would never change.

Species survival and propagation is the name of the game. If you're (the general you) not for that, you're a fairly poor example of a human (which is not meant as an insult, it may very well be that the same things that make someone a bad human make them a good person). I would just prefer if we could achieve both, and be good people and good humans.