Another thing I should add, in Nature, bad genes die off through natural selection. With humans, we have children at will, no matter the partner. Good and bad genes are passed to the next generation without care of the child. its why deformities and other sicknesses are very common in the human species from birth versus what you find in nature. Bad genes don't die in the human species since survival of the fittest doesn't apply to us since even the sick live full lives.
If we can get rid of these bad gene through gene selection , which is what nature demands anyway, we can also "kill off" bad genes and have good one.
While I wouldn't called it natural, the truth is that there is a selection occuring nowadays: the western model of societies.
While not a major selection per se, the fact that modern societies look for a pattern of beauty and have their fashion patterns states a selection is occuring, because the ones that follow those are more likely to find a partner and have children. To an extent is the same old thing of cheerleader + sports guy!
Also, let's not forget that people with serious deformities are likely to not finding a partner and not having offspring.
Last but not least, there's abortion!