Even if overpopulation is a problem, genocide is a terrible way to go about solving the problem. Though, if you really want to save resources, you could just kill off everyone in all the wealthy countries.
Ah yes, kill the golden goose for its meat. Brilliant solution.
America, the world's wealthiest country, is the biggest exporter of wheat, while most of Africa is starving to death even though they live on top of giant stockpiles of natural resources.
Listen to me, baby, you got to understand, you're old enough to learn the makings of a man.