I think a lot of times it goes beyond the understanding of human nature to really wanting to look at downstream consequences of different plans and actions. On the surface something like Marxism seems to make some sense, but we know that it creates an unworkable system because it ends up being contrary to individual interests. But when that happens it leads to something else and to something else.

As the expression goes, the road to hell is paved with good intentions.

You might believe it’s a good idea to have people of different races and ethnic backgrounds together. However, you have to do it in a way that makes things better rather than worse. Government fiat gets you mostly negatives with none of the positives. If you bring people together around mutual goals and share self-interests things happen a lot faster.

Here’s a possible analogy, a society is better formed by planting the seeds and letting things grow than trying to engineer utopia