> drivers killing people That seems like a wild stretch... I guess you mean people with obscured plates feel more free to speed and/or drive dangerously, which

> drivers killing people That seems like a wild stretch... I guess you mean people with obscured plates feel more free to speed and/or drive dangerously, which will eventually lead to accidents and deaths? That's rather attenuated to justify vandalizing someone's car. But even to the extent that's true, snapping off plastic bits obscuring license plates does nothing to help. The driver will either be unaware the bit was snapped off, in which case they will drive just as dangerously as before, or they will notice, and can simply replace the obscuring plastic piece, and continue to drive as dangerously as before. It's a dangerous path to invent arbitrary moral justifications to do whatever you want. Let's say someone sees you pulling pieces off other people's cars. They might decide they have a moral right and duty to punish you. Say, subdue you and chop a finger off -- your just desert for laying a finger on other people's property. Does that sound good to you?