User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-89.142.72.92-20141020153716/@comment-3430127-20141020211239

I think Shay's problem is more that he likely didn't realise he would kill so many people. I would say that even somebody who decided that sometimes a innocent may have to die for the assassin/templar cause would still be furious if they felt they were decieved into unintentionally killing a large number of innocents (Which I'm assuming is what Shay thinks happened, I've not paid too much attention to game news to avoid spoilers), as opposed to being forced to kill somebody who would reveal your presence to the target/guards/etc, which some people can justify to themselves.