In this section of Lancaster, people drop off cats at the park because they know one guy (who happens to live across the street) feeds them. I've counted over 30 cats now - and they've gone feral.
Good luck - SPCA - won't touch it. Lancaster - won't touch it. Dept. of Health - won't touch it. Dog catcher - won't touch it.
The way that I look at it is that just providing food doesn't make an animal live a happy life - they can find food on their own. Feeding them just exacerbates the problem. Responsible pet owners who spay and neuter their pets are the best prevention against these issues....