As much as I empathize with the protesters (the ones who are conducting themselves in a peaceful manner) and thier plight, it is a federal crime to interfere with interstate commerce and were such a crime to be committed, I believe it should be handled in a very firm manner.
I'm a bleeding heart generally speakng, so I'm not usually on the side of quashing peaceful protests (though in my opinion the most right wing amongst us should be just as supportive of the right to protest against the government but are not in this case due to other [I'm being polite here] reasons that have more to do with who is protesting rather than thier G-d and Constitution given right to do so) however, were someone to impede a rail line, bus line, airport runway, seaport or other transportation facility they are violating the rights of other people to travel, receive the goods they need etc., so I'd be in support of thier removal. In my opinion, the police should handle any such situaion very carefully and the protesters should be sure to carry as many video cameras as possible, though even proof sometimes doesn't help when it is the rights of certain people who are violated.
But anyway, off the high horse I like riding so much, federal crimes that cause others to not be able to excersize thier rights should not long be tolerated and any people who would hypothetcally commit such a crime should be asked to leave and then, if they don't do so peacefully, they should be removed with as little force as possible.
Be well. Do good work.