"I don't see what's so wrong with allowing visitors."

He's quiet! He doesn't make a mess or get drunk or cause a ruckus! Really, what's the problem? All he does is sit quietly and play boardgames or talk, keeping Anduin company. Is that really so offensive to their sensibilities?

Setting the ladder, Wrathion boosts himself up it and comes to rest on the top of the wall -- waiting just out of the way for his companion to climb up so he can pull up the ladder behind them. No point leaving it outside after all.