Snowden wasn’t a stunt, agree with him or not he added a lot of new information to the debate.
Occupy was more of a protest than a stunt, it added mass mobilization and a catchy slogan.
But what positive contribution does this guy make? A mass movement of ‘citizens arrests’ of politicians is a bad idea on many levels so it’s not mobilization. He didn’t add any information like Snowden did so there’s not that.
Is he an effective spokesperson? Doubtful. Almost everybody has heard of the claim that Bush and Blair are guilty of war crimes, what they need is for respectable people to endorse that view and explain the implications. The idea of random citizens ‘arresting’ politicians is not an implication people will like so they’re more likely to resist the war crime arguments on those grounds. And respectable people won’t want to be associated with him so they’re less likely to raise the war crimes issue.
Now if he went up and tried to question Blair (which it sounded like Blair would have engaged with) and asked him some intelligent questions that might have been interesting, but this, maybe you find it entertaining and that’s fine, I just don’t think it’s helpful.