There is no system of governance or economy among humans that you wouldn’t reject, if you reject every one in which wrongdoing takes place or people enrich themselves unjustly.
That’s my point. “I reject capitalism because people can benefit themselves by doing injustice within it” is dopey, because that predicate is not unique to capitalism; in fact it’s universal. In every system of the world, people can benefit themselves by doing injustice within that system.
Therefore, the person who reasons this way would reject any conditions under which they might find themselves living.
Whatever “reject” means here, I’m not entirely sure.