From the defra website:
The sum of evidence strongly supports the view that, in Britain, badgers are a significant source of infection in cattle. Most of this evidence is indirect, consisting of correlations rather than demonstrations of cause and effect; but in total the available evidence, including the effects of completely removing badgers from certain areas, is compelling.
My comment is, badgers are not babies! They are a pest, if they didn't look cute, would you still be opposed to the cull?