This is a good topic, I like it.
The author already highlights that we already have all the tools we need, we just have to implement them. They mention various drugs that exist, like oxytocin, psilocybin, and MDMA, especially if combined with therapy, can help people become more pro-social while also helping with other mental issues they're facing.
The bigger toolset is the one that all countries are aware of, but are not always great at distributing: education, poverty reduction, and healthcare. Look at all the places that have lower crime, more pro-social behavior, etc. Sure, we can say "these are more collectivist cultures, as opposed to individualist ones". But, is that even accurate? Is Sweden really that collectivist, for example? Or does a society become more collectivist, less individualistic, because less people spent their childhood in survival mode?
Poverty reduction works. Education works. Healthcare works. Poverty reduction helps people feel not desperate, allows the to fulfill their potential. Education builds on this, giving people more capability to take care of themselves and others, it exposes them to scientific reasoning and critical thinking; it also widens the generation gap and lowers birthrate because uterus-bearers have more job prospects beyond breeding (and school just takes time to complete). Healthcare also builds on this, as healthier people don't need as big of families to ensure they survive illness, since illness is less severe and less frequent; when babies survive, people's minds look to the future. Better healthcare includes community health and mental health, to further protect people and help people respond to stress and trauma, to support them through it in evidence-based ways.
Moral enhancement is generational. You work on the current generation by making things less desperate for them, so it's easier for them to cooperate. But the more important work is on successive generations, because our brains get shaped by trauma or lack thereof. As one of you pointed out, antisocial behavior including psychopathy is also a useful adaptation in specific contexts; we actually know what causes it, and it makes sense for humans who have been exposed to trauma as children and survive it to not be so trusting and altruistic of others. I took a couple of graduate-level classes in the philosophy of biology, and we extensively talked about psychopathy (sociopathy, same thing). And in my nursing education, we took child development classes and a number of other classes, so I could see a lot of the effects of childhood environment on the person. Children who are exposed to less trauma, less neglect, less developmental issues, who have "enough", are more likely to become well-adjusted adults, even if their parents kind of suck, and then they go on to help the next generation be better still.
This video is a great, quick primer on the power of poverty reduction:
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