TNR stands for Trap Neuter and Release. It is an effective way of controlling a wild cat population, but because it means you have to have dedicated people involved, and resources (traps, and time and patience) it is an often overlooked way to deal with feral cats.
Basically, you set your traps (humane traps) and you capture each cat in the group, take it in to a vet to be fixed. Then keep the cat for at least a week while it recovers, then turn it back into the exact area you first found it. Once the entire group has been TNR then someone comes in to manage the colony- feeding them at scheduled times, providing water and when necessary medicines. Most ferals live a long time this way, and once they know that food is available on a daily set time frame, they stop getting into garbage and getting into mischief and become a wonderful group of feral cats.
With all the females and males fixed, there are no new kittens, less cat fights and territorial squabbles, the lives of the cats are extended and there are no kitten mortality rates anymore.
Most people do not want to expend the time or try and locate the resources to do this, a quicker fix for these ferals (in the uneducated population) is simply to dispose of them. Kill them and be done with it.
The reporter's answer showed me, he is not interested in the facts, he simply reports them and he really does not have a clue about feral management at all. But he is not alone, many are clueless.