I'm afraid it still won't get me going to Critical Mass. Yep, car drivers hold up traffic every morning, but there's a subtle difference - they're not doing it 'deliberately'.
Lots of cycle commuters at the front of a queue similarly wouldn't be doing it deliberately. CM, manifestly, does. I still fail to see how that gets people thinking "I should get on a bike", but rather reinforces the view and opinion that bikes 'get in the way'.
The police were wrong, obviously, very very obviously, but I don't think for one second that a lot of people taking part in that CM and hanging round would have passed the 'attitude test' that actually makes the police much easier to deal with and more willing to listen. Takes two to Tango, and without seeing film of the initial approach by the police we're also lacking the response from the CM cyclists to try and work out why things escalated.
"... when it comes to bikes they arrest you for obstructing traffic with a trailer.....is that even an offence????"
Technically you can aver anything on a charge sheet. Whether it sticks or not is another matter. Although obstructing the highway IS an offence. Note again that there is a difference between deliberate obstruction and merely being in a slow-moving/stopped queue. You may argue that CM is merely a slow-moving queue, and that everyone in that queue is incapable of moving faster than the 10mph at which it is travelling. That's not to say I'll believe you, but you can say it.
Having a trailer bike is not going to get you arrested from now on, and had he been cycling outwith CM he would never have been done - please can we differentiate between the two actions of cycling normally and cycling in CM. CM IS provocative, deliberately so, and will always, naturally, get people wound up. And in the situation in the video, quite frankly, no-one wins. And certainly not cycling! (I wouldn't want to have a driver do something on my commute and find out this cop was the first on the scene - not because I think he's anti-cyclist, but because recent events may have rendered him so).
I should add, for balance, that in my dealings with L&B Police they've normally been alright. Not perfect, but alright. But anecdote is not the plural of datum.