Having children do it does decrease the chance of being broken up for obstructing cars.
In Vancouver, we were having a great ride through the city. We may have been delaying traffic a bit, but that's fine. Then they decided to ride up the Lions Gate Bridge (the main artery in and out of the city) and stop all traffic going in both directions for about 10-15 minutes.
The friends I was with all agreed we wouldn't participate again because of those actions.
The intent of the infrastructure is to move people, cars and other motorized vehicles hijacked it and excluded other users.
And to claim that cyclists are violent towards drivers is the pinnacle of absurdity. Drivers using their 2 tonne heavy machinery as a weapon, driving towards people, and then you blame the victims for tapping on the bonnet of the aggressors weapon.
If roads were built for those cars, one can't claim they hijack it when that's what it's for.
We can argue it shouldn't have been built that way, but given that it was (in the US anyway), there's no hijacking involved in using it as designed.
Critical Mass cyclist attacks car with U-lock in San Francisco https://www.kron4.com/news/critical-mass-cyclist-attacks-car...
Minivan's rude introduction to Critical Smash https://www.sfgate.com/bayarea/matier-ross/article/Minivan-s...
A Toyota mini van sits in a repair shop in Mountain View with a broken back window and numerous scratches to the body. The van was attacked by critical mass riders last friday. At the time of the attack a woman and five kids were in the car.
And one from 2015 where the driver endangered the cyclists "then a driver of a Zipcar moves toward the cyclists."