Not quite. Dont get me wrong capitalism sucks and we should get rid of it, but for example colonialism is older than capitalism and part of its cause. So is colonialsim the root cause of evil? not quite again before colonialism there where still a lot of repressive and very hierarchical societies so again to frame capitalism as the root of all evil is ignoring a whole bunch of other repressive systems that are older but are certainly strengthend by it.
So if you want to simplisticly frame something as the root cause of evil then it would be "opressive hierarchies are the root cause of evil". but maybe im biased here since im an anarchist