I assume there is an alternative solution to TB spread, which takes some time to set up. Also, perhaps if you've contracted and legislated that culling is take place you can't easily revert that.
230,000 badgers have been pointlessly killed in the cull since 2013, despite Government data which found no evidence that culling badgers has had an effect on eliminating tuberculosis in cattle.
The government says the cull has no effect on bovine TB. Seems like killing thousands more animals for the sake of fulfilling a contract is kinda shitty, in my opinion.