Well I think that keeping yourself in the headlines always has a good chance of getting you somewhere. Of course I know that attacking paintings didn't get women the vote, but it put their cause in the headlines, just one of many strategies. Then you have to convince the people who you've made indignant that while they may disapprove of what you're doing, it shouldn't mean they have to disapprove of your cause. Which they are now aware of because of what you are impolitely doing. Being polite means writing to your MP or signing petitions, and we know how far that gets you. Not living near the M25 means that I haven't had the opportunity to be inconvenienced by the protesters, so by all means call me Mr Smug. Lastly, let's try to avoid tarring every road protester with the same brush. They are individual human beings with their own perspectives, not necessarily all sinister middle-class ex-student union rabble-rousers. If you don't know them personally, you simply can't say. That's not being a leftie. That's being fair-minded.

By the way, DMcG, the logical fallacy you refer to is POST hoc...