Free market? As in, competition between different enterprises? And what do you think happens when one company "wins" that competition? It will use that power to establish a monopoly (or a cartel with a couple buddy companies). Both "free market" and "private monopoly" are capitalist fenomena, just at different stages of development of industry.

Sure, everyone should work for free except you, of course.

Patents only last 15 years. why isn't the government making insulin.

Personally, I think that if small business capitalism actually existed then it would run contrary to that.

There would be no need for copyright or patents. These systems create artificial scarcity which hinders society as a whole to benefit a minority.

I feel like our existing system of laissez-faire capitalism fully embraces the rent seeking found in intellectual property.

Okay here's the thing: Calling policies that contribute to monopolies anti-capitalist makes no sense, because by this standard capitalism is anti-capitalist. It's not like monopolies appear out of thin air; concentration of wealth into monopolies or oligopolies is the only possible equilibrium state under capitalism, so deflecting the effects of these monopolies as "anti-capitalist" is an appeal to fiction.