Why not also start enforcing littering fines? A $270-$500 ticket should be help to incentivize a behavior change.
I don't believe this premise, yet I wonder sometimes if keeping the peace in regards to smaller offenses would lead to fewer incidences of anger turning to road rage or violent crime. If people do not feel safe or that they have civil outlets for resolution of grievances, perhaps they're more violent? I'm curious what the more social science oriented on this site might know about this.
In any case, there's still yet another reason to enforce laws against small crimes: littering is a terrible thing in itself!