This is really sad, and people really shouldn't breed without knowing what they are doing...
But breeding doesn't always has to be a bad thing.
I live in Portugal. It is less than 100, the number of people who own rats in my country. No more than 200 rats exist here for sure. Unfortunately, rat is not a common pet around here (yet), but then, fortunately, we don't have need for rescue either, cause there no abandoned rats. So, if it wasn't for breeders, i could never had gotten my babies.