Well the argument “People in capitalist economies do not contribute out of free will” is something you just pull out of your ass, to define your side as the ones that will “contribute out of free will” (hence, the good side). This is the same logic you see in religious cults, where they define that themselves are moral and right, and the outside immoral. It really doesn’t deserve any serous response since there is no response that will be able to penetrate that kind of brainwash.