This is why cat's shouldn't be allowed free range outside. All letting them out does is put smaller sized wild animals at risk. This could have been something threatened like an Indigo where every one in the wild is needed to help support the population.

Feral cats breed faster than dogs yet it's pretty unusual for laws & regulations to address them even in places where dogs must be restrained [leashes, invisible fencing, etc].

Yet most cat owners see this as blasphemy and think that their pets should be able to do whatever they want, wherever they want.