It's only becoming even more common now with Alliance Raid Roulette that trolls purposefully change or delete waymarks just to be assholes. There should be a system message that says who is changing what so that person can be kicked for harassment. One might argue yeah but then they can flood your message box with system messages. Yeah but what's worse, people getting confused mid fight and missing a boxed off add (Rabanastre and World of Darkness) and it doesn't get killed in time, or some jackass spamming your text box who you can easily kick?