What you're missing is that it is enough for one single law to be problematic.

If we had a complete, utopian set of amazing laws that provide happiness to all, and I add just one law : "All citizens have to agree with every edict, statement or choice of SiempreViernes. Expressing disagreement or doubt is a crime, punishable by exile, lynching or lifetime imprisonment."

All of a sudden this society just became a nightmare. Yes the majority of people can probably still live an OK life, but that single law has a gigantic downstream effect on happiness, stress levels of all, and life expectancy of free thinkers.

Now add the idea that you're able to perfectly prevent crime, and you now have a totalitarian surveillance panopticon in place to prevent me from even writing any doubts into my personal journal.

Not most, maybe just one.

Consider a Schindler's List type scenario. It's a crime to help a Jew escape. Now mostly I believe in the rule of law and if I broke a law because I thought it was justified in that particular circumstance I would accept my punishment.

But in that scenario, accepting my punishment would mean I couldn't help others.