As teachers, I think most (if not all of us) would love to have a true "marketplace of ideas" where students can have brilliant, insightful conversations amongst themselves and their teachers. We don't want students simply regurgitating what we teach them. We want them to be independent thinkers, problem solvers, and "think outside the box". The problem is, students don't always do this in an appropriate manner. They sometimes do and say things just to get a reaction or to prove something. Others just go along with the herd and never speak out or speak up about issues that are important to them. It is our job as teachers and administrators to balance that freedom of expression by appropriate means. Kids are always going to try to "push the boundaries" of what is acceptable and appropriate, especially in the public school setting. We can't always anticipate which direction they are going to push, but we can be there to corral them when they start to stray past the line of "what is appropriate".