I've always thought that the SWP existed solely to convert any right-minded souls who stumble into its path to the righteous cause of anarchism. If ever you need proof that 19th century vanguardist socialism is a lost cause, and not even a desirable one anyway, simply pop along to an SWP meeting. I guarantee you will leave that meeting in no doubt whatsoever that having a hierarchical leadership with nothing better to do than adjudicate over various schisms and dole out endless five year plans for installing themselves in the exact same position our neoliberal masters currently hold is no way to bring about radical change.
And even if it was, could you imagine living in a world run by swappies? A world where everyone talked in meaningless self-congratulatory jargon and sang that fucking song every damn day? I would be joining the queue to be among the first against the wall I reckon.