This is a great video of from trapping a feral mom all the way from raising her kittens to getting them adopted in a foster home. It perfectly explains everything talked about on this site:
Feral cats may not want to be near you, but they're still great moms for their babies! This video shows how you can give feral cats a safe space to raise their young. While the kittens can be socialized and adopted, a feral adult cat cannot be socialized and does not want to be indoors.