I don't know for sure it can be completely pinned down to Capitalism, although it's definitely not much better than any other political system. What I think it might boil down to is the fact many of the existing political systems are all poorly thought out by their very nature. We weren't meant to live like machines, period. Be it Capitalist/Communist. We are social animals who would be much better off imo if we would have just stayed as hunters/gatherers in some kind of modernized way, or maybe even not in a modernized way. If we all went extinct because we didn't have Hospitals, and modern healthcare for example, we would still feel a sense of universal engagement and belonging.
What maybe happens in modern times is that there are certain types of personalities that are suited for living in political system A,B,C and the rest all live in some kind of isolationalist nightmare where they're stigmatized, or worse, jailed/tortured/killed for not being a good fit. I'm aware hunting/gathering societies had immense suffering at times, and I may be completely wrong. To me though, it seems that a human hunting/gathering society would always have a universal sense of belonging, and much more social engagement for all members of such a society. In modern times it would bring immense suffering anyway, much more, because we've fucked the environment into the ground, and reached into the collective consciousness of every human way of life in every corner of the globe. How many people are still NPC'ing it when things are getting so obviously worse? Business as usual, it'll all burn down eventually though.