Instinctively I am inclined to agree with you, it feels very wrong to disrupt people's lives but rationally I know without the use of those methods I wouldn't be allowed to vote in the election tomorrow.
Right, and I think that's the point. The entire exercise is meant to draw attention. A group of protesters blocks a highway, and suddenly the eyes of the world are on them. Police is called, citizens are disrupted and yelling at them, the media's heads over with cameras. It's a theater designed to draw attention and put eyeballs on any movement.
However, there is no need to do it in that manner. You can look at the protesters in Madrid last week, which was organized and prepared for, and created lots of traction with minimal unplanned disruption.