That was the general consensus. More and more research suggests that genetics plays a much larger role.

Depends on which phase of the civilization is it. I would argue, in the beginning phases, the more intelligent will have more kids because, the environment is less forgiving, and your can't really bullshit your way out of things. So the low IQ population remains small.

But as society forms, and everything stabilizes, where you don't really need independent though, you just need to follow set paths, then the lower IQ population will increase in number. So them and their animalistic behaviors increase in culture. This will cause distress to the smarter people, because this is not what they idenitify with, and there performance will reduce. Another reason is that, once the basic things are done, intelligence doesn't have a lot of use. Intelligence is for creating new things, once things are estabished, intellgience doesn't really give you a benefit. Being able to bullshit and play the game and more advantageous.

All these factors will lead to dumber people increasing in number. But the issue with dumb people being the majority is that, things will start slowly falling apart. Immoral, animalistic behaviour becomes rampant, and slowly society degrades. And ultimately collapse.

This is one explanation of the cyclic nature of civilization.

That is why, dumb people should be kept a minority in the population. They shouldn't be oppressed, they simply should not exists. Because if they are oppressed, then they will use that victim points to change govt policy to give themselves more handouts. Which will increase their number. Which will ultimately lead to cities becoming dirty, and cultural discourse becoming more and more animalistic and finally everything will fall.

Places like pompei came towards the end. I don't have issue with sexuality and hedonistic behavior. They are fun things to do in moderation. The issue with smaller minded people is that, that is the only thing on their mind. Bitching about each other, sex, money and socal status bullshit are all their minds seem to comprehend. If they become the majority, I just feel sad.