This isn't even the argument though, usually the freedom people assume that capitalism assumes people are good which is why it allows their 'unregulated activity'.

The problem is that capitalism doesn't actually have a consistent moral argument. It alters depending on context because as the Disco Elysium quote goes to it is about control. Not a specific argument.

Humans are shit and love killing each other and need to be controlled so capitalism works?

This one is winning so far as a message because it sells more slop to hogs.