TBH, I'd file it under the same heading as Britain Furst getting all those likes on Facebook - it's a populist message which, on the surface, looks like a valid cause worth fighting for, and for a lot of the kind of people who don't go any further than some kind of instant "bloke put in prison for standing outside a courtroom? That can't be right!" reaction, it will have some appeal. And, once that reaction's been had, pointing out that the twat's a far right mover and shaker and generally antisocial bit of cuntitude then tends to look - to the uninformed - like an attempt to support that terrible act by a bit of ad hominem - "Well, even so, nobody should be shut down for wanting to report the truth - this is a free country".
It won't take very long for the truth to sink in to the vast majority of those people, who will then shuffle off, embarrassedly, and quietly hope that everyone forgets that they showed him any support.