Earlier quoted context omitted.
I agree that protestors have no right to destroy property that doesn't belong to them. I don't agree that the police should be expected to confront protestors just because they shut down an interstate. You have no basic human right to not be inconvenienced at all by non-violent protestors. Non-violent protests that happen to shut down an interstate at some point should not be met with riot shields and swat teams.
We're going to disagree on that because the alternative is a breakdown in the rule of law. If you're going to block a major thoroughfare, you should expect police response (it's illegal for a good reason), and that response to escalate if you don't cooperate. You don't get an exception to law to harass hundreds, possibly thousands of innocent people just because you feel put upon.
Not to mention that almost every form of social progress came at the cost of inconveniencing all those poor, poor people who want nothing to do with the struggle for civil rights, universal suffrage, etc...
When you put convenience and order over basic human and constitutional rights, yes, you bloody well should be inconvenienced. The status quo 'inconveniences' these people every day - far worse then a blocked freeway. Perhaps you should channel your inconvenience at the oppressor, rather then the victim.