It looks like a sledgehammer to crack a nut given the poor potential (not definite) benefits - 12% to 16%. And why the sudden rush? It is not as if millions of cows have to be slaughtered as with foot and mouth.
DEFRA does not even know how many Badgers there are - it only has estimates. In W. Gloucs it is between 2,900 and 4,500. It wants to reduce numbers by 70%. Well, if it works on the upper estimate and the lower one is nearer the truth the cull could wipe out the Badger population altogether.