Yes. The earths population could be decimated and society would continue on. We could certainly benefit by losing the violent ones.

> The earths population could be decimated and society would continue on

Which it has, in the past, multiple times. But how would we know if we're better off with those "decimation events" or not? Kind of hard to know without some alternative reality where those didn't happen.

Well, I guess we have to run some experiments decimating the earth then list the pros and cons. Someone else can write the thesis, of course.

"We should sterilize 90% of the population because we can" is certainly one of the opinions of all time.