[diacritical]

Look up on negative utilitarianism and the Benevolent World Exploder if you want to find more info on the button idea.

Basically the idea is that if minimizing suffering is more important than maximizing pleasure, a world with no life would have no suffering whatsoever.

Regardless of whether you believe that, removing humans only would still leave the unfathomably huge amount of suffering of wild animals and after a while someone else will evolve and take the role of humans. However, if we leave humans exist, they could either destroy everything anyway (like with nukes or AI) or eliminate suffering like David Pearce and others imagine.