It's a meme.
"They aren't enforcing the gun laws that are on the books now."
Do we want them to?
Sure, everyone means they aren't prosecuting felon in possession, but there's scads of other malum prohibitum laws being ignored that don't affect anyone but us normal folks. Bet you thought you weren't breaking the law, didn't you?
We shouldn't be attacking this from the "but you're not enforcing the laws we have now" angle but should be presenting, "if it's not going to be enforced, let's remove it from the books."