People fear harassment because players can be jerks, and show it when empowered to do so. They will spam vote abandon, they will leave instances that can be done easily the moment anything happens, (especially tanks), and they will complain endlessly about bad players as a way to stroke their own egos, and reinforce an us versus them mindset. Adding parsers to the mix might make it even more volatile, for a game that has a very weak sense of community to begin with. Where you think this is justified or not, is up to you. But I really don't have much faith in people to act responsibly; i've changed to tank too many times to replace someone who left after one wipe in a learning trial, and seen too much forum talk for me to believe that.