Banned because environmental activists nearly drove a native English species, the water vole, to extinction by raiding the places where they raised american mink for the fur industry, and releasing the animals inside. Guess what one of it's favourite new foods turned out to be? That's right, water voles. Guess how many natural enemies it had in Britain (excluding us, though not in the traditional sense)? That's right, none. So we have water voles nearly extinct (but recovering) and american mink being killed whenever they're caught up and down the country because of all this.
The morale of the story is, environmental activists need to actually know something about the environment, instead of simply being unemployed, anarchistic oxygen thieves.
