[the question] sorta gets difficult

Sure does!

boxing champions would be out of a job

I don't count that as violence -- it is consensual (and there's a modicum of not-always-successful effort to prevent permanent harm).

overpopulation

This has been discussed at great depth and refuted, e.g. by Max More and de Grey.

Why did you ask

No particular reason: Every now and then a thought come to mind.