many cultural practices have practical origins

Yeah. I remember some of the ones practiced on me.

The practical origins were things like control, degradation, fear. Practical purposes are not always valid or good. Some cultures are fucked up and if everything about them burned it would be an acceptable sacrifice for the amount of bullshit we're getting rid of.

early childhood infections

Okay. But Europe and Asia don't do this, don't have a long tradition of this. Do surrounding cultural groups?

What infections? Infections are well within the realm of academia, we study the shit out of infections, and with cis dudes doing most of the science finding, I think dick infections their causes and their remedies is something I would expect a flood of academic material on.

look down on

I don't assume they're less than half as depraved tyrannical and shitty as the dumpster fire I fell out of. Sometimes I'm surprised, sometimes I'm not.

common sense

Okay but is it? A few of the women in my family, extremely high genetic cancer risk, removed a breast at the drop of a hat, like first hint radical mastectomy being planned instead of any tests, no attempt to save anything. I, not being an insane reactionary defined by a childish trauma response and kind of liking my breasts¹ might take a more measured approach. I can't help but think these kids, these literal children, are not sufficiently informed for these decisions to be made with the amount of cultural inertia behind them.

¹and having anything to lose