Just a few examples:
Tech: The NoSQL movement thought SQL databases were slow, so they stripped out a lot of the parts of an ACID database to make it fast. Some of those parts turn out to be important.
Government: We complain about regulations, because we don't remember how bad things were before them.
Medicine: Anti-vaxers think we don't need vaccines, because they never experienced the diseases they have eliminated.
I think of Uber and AirB&B as great examples of this, too; they bypass all sorts of rules and regulations we have put in place for transportation and housing, and at first they seem to be amazing. They are cheap, efficient, and provide great service. But as they grow, we start to notice more and more negative effects to society. These are the same negative effects that we put the regulations in place to address.