For Dave N in Germany,
Very simplified explanation - short version.....
Badgers and their setts are protected by law.
The original protection orders were put on (in part) because of a horrific history of persecution e.g. Badger baiting - making dogs fight badgers in awful to-the-death fights. Shameful. Which nobody wants.
They were not protected because they were in small numbers, or in danger of dying out in this country or anything.
Unfortunately, in an effort to prevent animal cruelty, the farmers who were used to controlling the population now find themselves with their hands tied, and no way of protecting their livestock.
There was an original Badger Act in 1973, which was revised to be the Badger (further protection) Act in 1991, and a new Protection of Badgers Act was introduced in 1992 which consolidated and improved the two previous acts, augmenting their protection again.
So, as you can see, badgers have been protected for a long time now, and their numbers have boomed, with catestrophic results.
BTW, hunting foxes with dogs is also illegal in this country now.
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