I had to register here just because of this thread.
There is no such thing as good or bad natural selection, you're mixing moral values and believes to an event that does not contain any. As I understood it, it's the survival of the fittest. I mean those that can make the most out of the current state of their surroundings to reproduce. Humans still adapt. We adapt to these mindfuck of things we create so we can go on thinking we don't.
And those who don't think anything humans do is natural, I have to wonder where the hell did you get that idea? We're humans, we act human. We create things human. We are natural, everything we create comes naturally to us, there is no "unnatural" thing on this planet. Or to say, to us unnatural is natural. And we affect everything around us, the world would be very different place if humans never existed, so if you think humans aren't natural, you come to realize there is nothing natural on this planet.
I think idiocracy is true, but I think that high IQ in an individual is becoming more and more less needed and it's always been overrated by the mediocre people. Same as who runs faster or so. Why do I need to run faster, or have an IQ of 180, when there are smart people that have build me a car that I can use for fast transportation? The power is turning to co-working and very efficient exchange of ideas and resources. One example that has been used before is the computer mouse. There is no one man in this world that can make such a thing from harvesting raw materials from the ground to the finish. It's all done by a million of people.
Someone mentioned that solitary island being some kind of paradise for natural selection. Why? Those people become inbreds that can't compete or survive the change of their surroundings. There is a tribe like that living in indian ocean (http://www.privateislandsblog.com/2007/06/12/fishermen-killed-stone-age-tribe-off-dessert-island/). They're still using bows and arrows and are very hostile to the outsiders. It's been untouched, and natural selection is at work according to you. They lose the roll whenever you feel like dropping a bomb in there or wave runs over their island. So you think they're fit? Fit to survive? No. They're stagnating in stone age. And that's what happens when you live in a place where there's no diversity in ideas, resources or people.
Selection is happening, cultural evolution is happening, it was never about the strongest, not even about the fastest, it was always about the fittest. I just think it's funny when I look all the narcists that masturbate their individuality by running after some super-human, self promoting dream and think how they don't get to the next generation, because no one can fucking stand them.
I think the fittest thing to do in a world like this, is to try to make people trust and respect you, keeping yourself in a good shape physically and mentally, making your money with as little effort as you can to have all the things you need (never mix "need" with "want") and really love someone. Maybe there'll be kids. If there is, do everything you can to protect them while they are vulnerable, but don't be overprotective, it'll make them weak. Show them how you did it, give them values you had, and they might live to reproduce. Then you're doing something right: you're surviving, they're surviving. The rest is trivial, the average will sort it out.