The problem occurs when you have a party with 'Liberal' in the name. You see, some people may actually believe that they are truly liberal, when the reality is that they have long since given up on their classic liberal history and now just cannot resist the delicious prospect of inflicting their personal intolerances on the whole of the country.
Like this, for example, and the further ludicrous bans proposed in the comments (barbecues, I kid you not).
Shouldn't the Lib Dems just come clean now and admit that they're plain, old-fashioned Social Democrats, and not in any way qualified to carry the torch of liberalism?
Anything else is just electoral fraud.
The dismissal of factions like Liberal Vision as somehow being entryist cranks is particularly startling too.
