Is anybody the "bad guy?" Is anybody not?

The Earth will fix itself, eventually, no matter what we do to it. It's seen worse. I mean it apparently went from a ball of lava pelted with meteorite-nukes to the only verdant garden we have ever known, and it has already been through at least a few cataclysms.

Even if the planet disappears overnight, the universe at large will still go on as if we never existed.

You choose the scale you want to care about, and some levels require some sacrifice on other levels.