How can a capitalist system exist that is not inherently authoritarian? If someone refuses to follow the rules ... you get the idea. The only difference is that they become the authority instead of being punished by it, but the practical effect on the vast majority is the same. See: Stalin's USSR vs. Putin's Russia. Different in theory, but both authoritarian and both imperialist and both (not coincidentally) very oppressive toward any kind of minority.

Again, this issue is orthogonal to the economic model. Authoritarianism can and does exist in every economic system. The antidote IMO is institutions which define and enforce rules without bestowing permanent favor on any one group. Democracy, federalism, checks and balances, yadda yadda. I even mentioned social democracy already. But don't take my word for it. I suggest you actually study the issue for yourself, not just polemics from one side but the actual history of how these systems have developed and the theories that have been developed with them over centuries, then reach your own conclusions. They might not be the same as mine, but I guarantee they'll be even further from the laissez-faire extremists.