Protection of the speech that we find offensive is critical to protecting our right to speak. If we ban our opponent's right to speak because we find their words are offensive, then we open the door to someone banning our rights (not just the right to speak, but perhaps even the right to worship) for the same reasons. Second, each of us as a fellow human control our own selves, and it is our responsible to not harm others. Words by themselves are irrelevent to our actual actions unless we are part of a conspiracy to act together to harm others (such as in the case of gangs that are ordered by their leaders to commit crimes). The only people who should be held accountable for the actions of killing another are those who did it and those who told them to do it. Being offended by the words of our opponents is no excuse for harming others.