Foxes are natural predators.
Man has always found a reason to kill off predators as they provide competition.
Predators are rarely vermin as their population is so easily controlled by controlling their prey populations, which they do naturally as part of their very existence.
If we leave food out for predators (chickens in vulnerable hutches, kebabs hanging out of bins), we create the problem ourselves.
Solve the problem – don’t kill the fox.