Isn't the issue with laws that those breaking them don't usually care about laws? I'm sure you have laws in place against murder, and murder still happens. "But there's a law against burglary, why would you want additional protection and have a strong door" isn't a good argument.
There are good arguments (and the whole issue is a good gun control argument in general), but that really isn't one.
Sure, there are also some people who violate gun laws. But those people could be a threat to everyone, not just cops, yet surely we wouldn’t justify everyone to preemptively have their guns drawn in all human interactions.
Not necessarily drawn, but isn't that pretty much the reason you have public carry laws in the first place? Surely even the worst of cars does provide sufficient protection against roaming coyotes and mountain lions. The only predator left to fear is another human.