I think it's clear that the label that gets applied to acts like this depends on how a person feels about this sort of thing. As a member of the Guardian Angels, I am considered an activist. Since we intentionally demoralize gang members, we could be validly be called terrorists by violent criminals. While not exactly pirates, we are not above taking crack, weapons, syringes, etc. away from people in public WITHOUT THE DUE PROCESS OF LAW. Most of the public loves us, especially in our patrol areas. Most habitual criminals HATE us. The city governments usually don't like us. The mayor of Houston in 1981 called us "hemorrhoids in berets". The next mayor was a big fan of us. The Houston Police Department, happily or grudgingly, accepts us. They have recruited 4 of our members, so far. It is routine for us to back them up, or visa versa. Boarding an oil rig without permission is a criminal act. Its purpose was obviously to make the news. Apply your labels.