I imagine it more along the lines of breaking a promise. Law is more or less a social contract, so it’s less that the law no longer functions and more that the person in question is breaking the agreement.

But also yes, one who repeatedly breaks the contract with no consequences, definitely calls into question the value and validity of the contact, and that’s when things really start to, erm… Break.

Would be funny for a bit though. “Yea, I know he shot someone, but some other guy across town did the same thing just a few minutes prior so technically he didn’t didn’t do anything illegal as the other guy broke the law.”