Both. It’s kind of like asking if monarchy is the problem or if the problem is just evil kings. Theoretically even a dictatorship can work out well for the people given a benevolent dictator. The issue is with the vulnerabilities inherent in the system. For capitalism, it’s that those with more money have more influence and thus it creates a feedback loop where those with more money have more power to get themselves more money and therefore more power and so on.
I dunno, apparently someone can support a genocide and still be considered a good guy these days.