Keeping in mind the fascist exception; everyone matters. Nobody deserves to die for the "greater good" (which is really just rich capitalists and the order that gives them power via wealth.) If our societies devoted our resources, creativity, and ingenuity to sustainably feeding 8B+ ppl instead of "make line go up" - the word "overpopulation" would cease to have meaning in a human context.
The planet is on fire b/c of fossil fuels, and the capitalism that can't exist without them. Not "people."