Quite arguable. Up untill legitimate medicines (i.e. stuff that can cure the problem, not just cover up the symptoms) were in fairly wide-spread use, it was largely upto nature. Yeah, we could take care of minor injuries that would have festered and potentially killed someone if left untreated, we still couldn't do anything about the people with weak immune systems that fell victim to disease.
Warhead, the problem is not everyone nessicarily should be included in the gene pool. Look at all the handsomehunk kids that think its funny as hell to draw swasticas all over the place, or break random people's stuff for no reason, or put eachother up on tables and pretend to rape eachother. re those the type of people that you want contributing to the next generation?
In some ways, hitler's view of purifying the race was correct, even if his choice of targets wasn't. We've grown soft enough that we let EVERYONE contribute even if it will end up having a massive negative impact on out society in the future, for no better reason than someone said "well its not their fault they're so screwed up. They MIGHT produce children that are functioning members of society.... maybe".
The idiots are the ones that over-produce. They screw up their kids because they don't know how not to. So for every 1 idiot we have now (both male and female), we will end up with between 1.5-3 idiots in the next generation. Where does it end?