Let's say you're in a raid, right? Maybe you're trying to get your weeklies or whatever. Hell, it can even be a dungeon. I've seen this happen multiple times across every kind of content you could think of.
So there you are, and you're DPSing, and maybe the tank just doesn't turn on his tank stance. If it's a dungeon, maybe he's pulled a pack of trash without his stance. If it's a raid, maybe the MT died and now he (OT) doesn't have his stance on. Either way, the aggro is on you and you're a DPS, so this isn't an ideal situation. And you tell him to turn it on, because now you're tanking as a dps. But he ignores you and just does his own thing. Aaand now you're dead. And now the other DPS is dead too. And now the healers are dying. And you wipe. You zone back in at the start, and nobody says anything because everyone's afraid to be critical due to the ToS. The guy who died second is like "let's just try again!

)" and the problem isn't actually addressed. And maybe -- maybe it happens again, the whole damn thing, point for point, and now someone finally says "dude, OT, turn on your stance so we don't keep wiping" or "MT, stop dying to [mechanic]" and now someone else chimes in with "calm down bro

it's just a game

dw bro just have fun

" and straight up enables bad play that's wasting everyone's time.
... snip for length ...
Or . Eventually you get tired of syrcus tower every day. And then you quit.