“It seemed like they were using their bikes as weapons,” Ferrando said. One of the bikers then threw his bike — shattering the rear window and terrifying the young girls inside.

All the while, Ferrando was screaming, “There are children in this car! There are children in this car!”

She had the presence of mind to dial 911 on her cell phone — and within minutes, the squad of motorcycle cops who were assigned to keep an eye on the ride descended on the scene.

Let’s all act surprised that the cops claim they can do nothing about this fine San Francisco traddition. Hell, even Oakland got some control over weekend cruising.

Note the mayor’s weasle-worded support for the mob. That tells the whole story.

As for reaction from City Hall, Mayor Gavin Newsom said such acts of violence — if true — “only serve to undermine the worthwhile message of Critical Mass, which is to raise the awareness of bike transportation issues.”

I like San Francisco. I really do. But the inmates are running the asylum.