I had an internet discussion with someone who believed that all regulations are bad. I don't think s/he's a troll, but tried as I might I couldn't get this person to agree that at least some regulations might be good.
Can't remember off the top of my head, but one argument was that even for major safety violations, the market would put them out of business, and other companies won't do it. I said that this would be after the damage is done and people/environment are hurt, but the person said that regulations are reactive anyway and companies would just stop doing it. It was very frustrating trying to get this person to agree that maybe some regulations can be good.