Points taken. And I agree that we should design systems to work with the natural tendencies of humans. But we can do better than (and I'm being reductive here) capitalism's current "eventually everything will optimize out even if poor people starve to death because they weren't born with money." In fact, I'd argue that 'modern' capitalism really is only activating a small portion of human nature (that is, the self-interested part), and shielding us from those aspects of us that are caring for others and concerned for other human beings. When we put everything from the value of private jets to food, water, and healthcare on the same value metric (money), and then tell people that whatever amount of money they have is indicative of what they are worth, it's no wonder we as a society wind up treating people as objects instead of human beings.
Anecdotally, the US is a nation with more than enough food and shelter for all its inhabitants. Yet many people live on the streets, often because they were born into poverty. This goes against most people's "firmware." Yet capitalism takes no account of that part of human nature (I'd argue those parts that make us 'better than animals.').