Sometimes the most free-thinking people come from the most illiberal backgrounds, in the words of that great mafioso, they did it their way. Though it often works the other way too. One way and another people often react against their parents and background.

As for IQ tests, when I was a id doing 11+ we used to have coaching in doing IQ tests. After a bit we could get perfect scores remarkably easy. Of course sometimes you could be too clever by half, and lost points because the markers hadn't spotted a correct alternative answer.

Yes, we all know there are religious traditions which are brutal in how they treat "apostates". You get it in other areas too, like religion. Even in sport. That's not really about religion, politics or sport as such. It's a kind of mobbing, and other species do it too.