I live in a state that had a pre-Roe abortion ban on the books. After Roe was repealed. local prosecutors tried to use their prosecutorial veto to prevent enforcement.

It was pointed out that if they straight up said “we won’t enforce the law” Private citizens could enforce it.

Usually, a judge would throw the case out, but if a DA had publicly refused to do their job, judges would find it hard to simply defer to DA.

I suspect private criminal prosecutions are so rare because public prosecutors guard their monopoly.