What is the point of London Critical Mass?

I don't particularly like the overloading of the event with all of the political stuff, but I like just going out on a ride with a lot of people, with no real purpose, and no real destination, and just enjoy the atmosphere.

Oh, and I think we (cyclists) act like jackasses when we do that thing where we go around a roundabout 3 or 4 times and severely block critical junctions. Our mass is a good enough reminder, I don't think we need to act like arseholes to show people we exist.
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init blud.