No you are not clear on any of this, as usual.
I do not advocate the saving of feral cats.
I advocate the reduction of feral cats thru spay and neuter.
I advocate the keeping of cats indoors 100% of the time.
I do not support the concept that a maintained feral cat colony will reduce rodents. You free feed feral/outdoor cats and other animals will show up to eat the scraps...and before long you end up with a bigger problem.
Red foxes were introduced here by the British for fox hunting as the native gray fox was too small.
(According to the Masters of Foxhounds Association of America, Englishman Robert Brooke was the first man to import hunting hounds to America, bringing his pack to Maryland in 1650 when he imported his horses and a pack of foxhounds. Also around this time, numbers of European red foxes were introduced into the Eastern seaboard of North America for hunting.)
And since day one, man has hunted animals for their food and their fur.
Nothing new there.
As a matter of fact, it was the beaver fur trade that caused a lot of western expansion by trappers, ie: mountain men, to provide pelts for the European fur fashion craze.