My current stance is guided by the occam principle or at least I try that, but make no mistake, people are actively trying to push for agendas that are factually opposed to human prosperity but you really need to be open to admit that such people exist in order to see it. It makes me wonder, people can make mistakes while trying to improve things on good faith, but doing exactly the opposit of what we can tell is good and stood the test of time, why?

For example, actively celebrating different ways to build a family while the normal family structure (2 parents at home) is prooven to be the best predictor for children going to collage. And examples like this are the norm, not the exception as far as I can tell

I think that you may be taking for granted the problems we don't have thanks to our traditions, and I cant blame you 1st because I did the same and 2nd because "good design is harder to spot since it doesn get in our way" (see The design of everyday things). Also, with complex systems you never really know long term effects and causal conextion in different variables, so if you try to design you tend to only sweep what you can't understand under the carpet and only decide based in what info you can understand, which tends to be limited, only to be caught by surprise later on by unforseen consequenses. (You can find good examples in "Systemantics")

I would say there is little room for improvement in social institutions (though not 0, things can get better) but if we could weight the pros and cons of the changes we propose we woud probably preffer the current problems as a tradeoff.