While it is helpful to vent, Marxist speaking they are not needed to be evil, the structures and systems mean they fill a role in which they are molded into acting in a way that makes you see them as evil.
Moral categories are not needed, but emotional fulfilling.
Yes, but Says and Ricardo did talk about what he mentions here rudimentary, too. Marx, but also later empirical economists and political economists more than 50 years ago did highlight that, too.