I'm not into politics whatsoever. I don't even know what left and right are besides two opposites on a spectrum of political opinions?
*I typed out this post, and then re-reading yours I noticed the "and I recognise that's not always due to economics". so I guess you don't believe that. So forgive me for incorrectly starting off this post with that statement.*
Correct me if I'm wrong, but these arguments sound like they're based on the belief that money = happiness. Growing up in an economically advantaged/disadvantaged household does probably correlate somewhat with a good/bad upbringing, but I'd be very careful to think those are one and the same.
It's probably an unpopular opinion, and I'd guess most people disagree with this, but I believe that generally not the individuals are to blame, but some part of the system. Either their parents, their education (imo every single education system is terrible), and/or bad circumstances. Of course there are people like Elon and Steve Jobs (adoption), who manage to overcome adversity, but I've been through some bad times myself, and the biggest thing I've learned is that in certain cases you can't claim to understand how others feel. Especially when it comes to pain/suffering, the rabbit hole goes deeper than a lot of people can imagine.
I'm open to changing my belief if given enough evidence to the contrary, but as of right now I don't believe that humans end up doing evil things if they grow up well, don't experience major trauma, and have all their basic needs met, which goes beyond food/water/sleep/housing and includes human connection, and physical and emotional well-being.
Maybe the problem is that that's still too uncommon in today's society in spite of all of our advances. But instead of punishing and hating the people who do bad/evil things, I'd rather focus on fixing the things that caused them to do those things in the first place. I don't mean to say we should give out hugs instead of prison sentences.... although... now that I think about it, I reckon people would commit less crimes afterwards if they were given hugs & compassion for 5-10 years instead of spending 5-10 years in prison
I came across this Reddit post a month ago asking about people who adopted children above the age of 5. I'd say at least about half of the stories are pretty rough. Don't think this is where my beliefs come from, because I've thought this way for much much longer, but even I was kind of surprised by how bad this was:
[Serious] Parents who have adopted a older child (5 and up), how has it gone for you? - Reddit