The sad truth is that well meaning people generally do not understand nature.
Predation, sickness, hunger, death, ect. are nature's method of keeping the balance which is necessary for the survival of other species. We feel bad, but it's been this way for millennia.
The WORST thing you can do is interject and feed wild animals.
Actually a very abundant population of foxes is what causes zootonical diseases such a rabies to flare up.
There is supposed to be a natural cycle of flourish, overpopulation, sickness, death, flourish....ect.