I've been trying to reconcile two recent incidents -- one in which an angry and violent mob was allowed to shut down a talk by Tom Tancredo, and another in which a perfectly civil journalist was arrested for trying to ask questions of the public outside a Katie Couric award ceremony.

Here's the video of the violent mob which shut down Tancredo's talk:

Notice that despite the violence, no one was arrested for anything. Instead, the police terminated Tom Tancredo's talk -- precisely what the violent demonstrators were targeting.

On the other hand, here's the video of journalist being arrested for asking questions at the Katie Couric ceremony -- which was not canceled:

So what is the First Amendment "rule" here?

Violent disruption of conservative events warrants cancellation of the event, while critical coverage of liberal events warrants arrest?