It has been scientifically studied and concluded that no matter how highly educated a person is, they still make a significant portion of their decisions based on a gut feeling, that is, instincts. It's an evolutionary adaptation to the need of making instant decisions as the predators of old didn't care to wait for a committee resolution before attacking cavemen. But it's okay, since in many situation doing anything is far better than hesitating and doing nothing. Hakuryuu is simple enough, in his lust for revenge being free of idealism and hesitation, that he could act while others just watched. Surely you aren't saying the mob brutally beating Madaura to a pulp in front of the children would have been better than the clean cut by a single person?
Now, I'm not saying Hakuryuu would be anything close to admirable, wise, or even intelligent, but at least he's got a goal. Aladdin is also working towards building himself enough to have one, thus he's going to Magnostadt to learn and see things for himself. Alibaba is out to apparently save the whole world without anybody having to lose or suffer in the process... But at least he realises he hasn't yet got the powers of a god to make it happen, but apparently he thinks he will, despite being so incompetent he can't even djin equip.
Fortunately I don't need to hate Morgiana. She's cute and can kick ass. That's enough.