Because 5 years in jail + felony conviction + $7500 fine is totally about other people's right to travel, and not about hammering down public dissent.

Is that the minimum or maximum penalty? If that's the minimum, it is excessive. If that's merely the maximum, then for reference if you steal mail (also a federal offense), the maximum penalty is 5 years in prison and $250,000 which seems much worse to me. There has to be some deterrent to prevent unruly protesters from forcibly preventing people from getting to work and potentially being fired as a result.

You don't have a right to drive your car, that is a privilege. We have a right to protest.

Are emergency services also a "privilege"? Do you think our right to free assembly means we get to block ambulances and fire fighters from passing?