Once a world is destroyed, it's gone forever. If you're smart, you'd know that it's not profitable at all to get rid of a world just like that, de arimasu. Everyone has a lot to offer, be they a daisy by the road, a prehistoric shark, or a Gundam model kit designer, de arimasu.

Whether they deserve to live or die, that isn't for him to decide, de arimasu. Besides, I bet he didn't even go through and make sure that all humans had really lost their wills to live, de arimasu. Sounds like something an amateur would do, de arimasu.