Population limits itself
If overpopulation were to be achieved, it will either A) not be a problem, or B) cause many people to eventually die because of there is no way for the people to live a sustainable life since the population limit has been supposedly exceed. A) if it is not a problem there is no need to control it. B) In that case there is still no need to control it because it will ultimately control itself. even though there is suffering from route B) there is still suffering caused by controlling it.