If they seriously infringe on the rights of other individuals, then yes I think they are immoral. Putting your own political motivations (no matter how righteous) above the rights of others is a selfish act.

The easy answer if you want to march down the street is you tell city hall and get a parade permit. Did anybody tell MIT and apply for a packet storm permit?

Marching down the middle of the street is not illegal. Indeed, many fundamental cases of constitutional law note that the street is a "per se" public forum, i.e., the most public a forum can be, and is thus subject to the highest protections for speech.

Marching down a street and merely disrupting traffic is thus quite legal, however, if your marching causes dangerous disruptions to traffic (i.e., accidents), then it is not.