I have a genetic disorder, as does my oldest son. It is homozygous recessive, which means my youngest son and ex husband are carriers. Both my kids were extremely challenging to raise and I ended up homeschooling them both, in part to not have my family wind up being "the next Columbine" in the headlines. I have a long list of ornery relatives and have a fair degree of familiarity with physical traits with known psychological tie-ins, such as red hair being associated with high pain tolerance and also high risk tolerance.
So, yes, I believe that. Europe may not have been explicitly trying to get rid of genes per se, but they did essentially ship literally boatloads of undesirables to both America and Australia, countries which have some things in common in terms of having maverick social norms, more so than a lot of older cultures.
I can't prove it in a few comments in a public forum, but it isn't just some idea I dreamed up earlier this afternoon. It is rooted in many years of reading and discussing the connection between inborn traits and characteristics like tolerance for risk. I am not someone who likes risk. But my genetic disorder has made me unable to go along to get along, even though my default personality makes me wish I could. So, yes, I see clear connections between socially difficult behaviors and genes.