This chapter made me like Shamrock actually. He's about business no wasting time, holding the children hostage is simply more efficient, and he doesn't value human life so it's great writing.
But yea, Aramaki is the complete opposite with how he moves, he is far too honest of a character. He strolled through the front door letting the entire alliance and BP remnants know he was there, it was suicidal honestly. He just doesn't gaf/ he really trusts in his ability in that situation, despite the odds being completely against him.