If the punishment was longer, I'd probably just go make a sandwich and wait for someone else to leave. I agree that your points a and b are not valid reasons to bail. There are, however, instances where you do get that DPS hellbent on AoEing all the slept mobs even after asking them not to several times. (Or they unleash some other kind of stupidity that makes you wonder how they got this far in the game (or how they manage to breath for that matter.)) If they cause multiple wipes due to shear ineptitude and show no signs of heeding advice given, they deserve the long queue that gets handed to them. Let them go sit in a corner and think about what they've done. Meanwhile, I'll be eating my sandwich.