Cops are understaffed and overworked in any major city. They have bigger fish to fry than worrying about stuff like window tint or really most traffic infractions that aren't just totally reckless driving.

Basically, if it's something that would just be a ticket and a fine, and not an arrestable offense, chances are good they have something more urgent to deal with. Even if it's something they could make an arrest for, if the prosecutor is just going to dismiss the case, why bother?

Chickens are coming home to roost after the last few years.