The natural supporters of the Lib Dems these days are not Lakeland farmers but town dwellers who feel rather warm towards badgers. I imagine they would find a cull very unwelcome indeed.
For arguments against a cull see The Badger Trust.
Tim also says that
Until Bovine TB can be eradicated, the Government must pay farmers a fair level of compensation for compulsorily slaughtered cattle.Granted the state is playing a role by insisting on the slaughter, but why can't the farming industry insure itself against such risks? Other industries manage to do it without demanding public money.