My grey tabby was feral at one time so if he catches anything it does not survive but the other two seldom kill anything they catch and I have no problem getting the victim free and letting them loose across the street in the woods.
Feral cats I am sure take a larger toll but... killing or trapping does not work as others will just move in to fill the void.
It would seem by your own statements about your domesticated cats, that without your life saving efforts, your friendly cats would kill all their little playmates?
"Killing" feral animals is the only productive measure at reducing their population or the damage they inflict. Look at Texas, Florida and many other southern states and the problem with feral pigs. Look at Australia and the Cane Toad, the Donkey in the Outback, the Rock python in South Florida. You really do need to be better informed on the unrestricted destruction that invasive species do to an environment where there is no natural predator to a species to keep environmental balance.
I could list examples endlessly of land animals, then move to aquatic animals... It's not overstated, it's under-managed.
Exactly, introduced species, we don't have too much trouble with donkeys Cal but Camels are a totally different story, the cane toad is the worst of the lot but the crows have worked out a way of eating out their stomaches by turning them on their backs, anything that tries to eat them from the top dies, you wouldn't believe the amount of dead snakes i used to find on my property up north, they all have a lump in their guts and when cut open, they all have a toad in them.. Steve, i was talking both domestic and feral cats mate, my mates mums cat kills absolutely everything that moves and has made a huge difference to the wildlife in their area, remember, we have NO native felines here and lots and lots of small wildlife, cats are a huge problem, both domestic and feral.... The sheer size of Australia and its relatively small population makes it hard to do anything about the invasive pest problems we have here...