Earlier quoted context omitted.
> The regulator can still set legal penalties high enough to stop any innovation, if they want to. A liability model has a couple of advantages despite this: 1. The regulator has some slack to not set penalties insanely high. As long as they're seen enforcing those penalties against someone periodically, and as long as the penalties sound like a big number to the general public, they can look like Stern Serious Regul…
The liability model has a big downside, though. Because sometimes people in charge are idiots, they ignore common sense and make risks. So they possibly get burned only when accident happens, which costs human health and lives. Regulation is intended to prevent human harm by setting and enforcing a safety standard.
(How is this different from an ordinary procedural regulator? Because the insurance market has competition, which means that the insurance companies aren't only trying to optimize for reducing risk -- they're trying to reduce risk efficiently. And if they're not very good at it, they can be outcompeted by someone who is.)