Similarly, my city library was spending much more collecting fines than the fines brought in, so they got rid of them.
Not something I'd want.
What do they do when there's an increase in bad behaviour which was previously addressed by fines?
No, that I didn't say that. I said there are no fines. You cannot check anything out if you have something over due and after a certain number of days it goes to collections. The library doesn't deal with fines. Which part of that policy would you be negatively affected by?
If you are being sarcastic in order to make that point, that may be too subtle to communicate with most people that don't think of it on their own.