You can tell that broad alignment between people is natural just by looking at the effort that corporations and governments make to undermine it. Alignment between people is perhaps not a state of nature, but it really is a pretty normal consequence of a fairly small amount of education and of middle-class existence that is left to itself (i.e. without brain-washing and deliberately working to create out-groups). If you're eating enough and have a few brain cells to rub together, then you definitely want that for your neighbors too because it promotes stability.
> You can tell that broad alignment between people is natural
It really isn't. The whole point of the market system is to collectively align people's actions towards a shared target of "Pareto-optimized total welfare". And even then the alignment is approximate and heavily constrained due to a combination of transaction costs (which also account for e.g. externalities) and information asymmetries. But transaction costs and information asymmetries apply to any system of alignment, including non-market ones. The market (augmented with some pre-determined legal assignment of property rights, potentially including quite complex bundles of rules and regulations) is still your best bet.
> broad alignment between people is natural
Uh, what? People have been killing each other over values misalignments since there have been people. We invented civilization in part to protect our farms and granaries from people who disagreed with us on whose grain was in said granaries.