What, exactly, is a "regulated free market?" That's kind of like a dry ocean or the color dark-white. A regulated market can have all sorts of trade in various shades of "free" but the spectrum is not
"regulated" - - - - - "free"
"command economy" - - - - - - - "free trade economy"
with the amount of regulation being a spectrum made up of those hyphens. "Free market corrected for externalities like climate change" means what, exactly? Because you seem to be a fan of a government built of mechanisms yet you eschew the mechanisms. "Harm" is pretty demonstrably "everything the free market does not see as its responsibility" and Saint Friedman himself said that "the market" had a moral imperative to do every shady shifty thing it could right up to breaking the law because if societies really care about something, they'll regulate its protection.
0% corporate tax is reactionary. You're implying that the social cost of a corporation to the society that harbors it is zero when the whole purpose of a corporation is to diffuse the responsibility of the individual. When I built the birth center we had an inspector come out to hassle us twice a week for the better part of a year. Who's supposed to pay that guy - you? Why would you do that? What about for the traffic I'm adding to the intersection? What about for the increase in EMS based on the profile of my business? These are all things that should come out of my pocket because the business I'm practicing is profiting based on the imposition I'm putting on society. And I'm just delivering babies. It's not like I'm Union Carbide. Economics says that if your business is low margin you should charge more. I'm not here to subsidize your vaguely-profitable dream restaurant I'm here to eat a bagel. If you can't sell me a bagel for a price that (A) I want to pay (B) you want to earn, don't sell bagels. That's Econ 101, which "most economists" also agree with.