Have you ever had other guilds steal your guild members? I hate that! Other guilds sometimes come into my guild and start LYING about me, so my members go to their guild because 'they didn't do anything and I did blah blah blah to them'.
It is so rude! I mean, sure, if they other person ASKS to join another guild, but it really annoys me when you say bad things about their guild so that person will join yours.