nobody is advocating for killing and eating people: just having fewer is the single greatest impact of any choice we can make in most of our lives. Like 1 person using only renewable power and electric cars and eating vegetarian etc is still WAY more impact than 0 people doing the same... Still, I had a kid, I'm glad I did, and I fully well recognize that's a very selfish move.
But no one is actually suggesting we impartially just eliminate half of the population.
well, except that one guy...