I see where you're coming from, but I dare say that you might be conflating capitalism with a market economy. There are many kinds of market economies, not all

I see where you're coming from, but I dare say that you might be conflating capitalism with a market economy. There are many kinds of market economies, not all of them are capitalistic in nature. I also don't agree with your premise that capitalism aligns people's self-interest with society's interests. Let's take a monopoly for example; getting into a monopoly position might be in the interest of an individual actor in a capitalistic market, but that's not in society's interests, not at at all. Furthermore capitalism tends to favor enterprises that manage to externalize as many costs as possible, primarily to the detriment of society which the has to socialize these costs, whereas the profit is privatized.