User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-25344053-20141106180850/@comment-5019018-20141106212643

But he's not hurting anybody here at this moment, is he? Why some people feel the need to get all worked up whenever anyone uses a word like "fuck" is beyond me. It's not really doing anything, so there's no need to call anyone out on it.

If Kain were calling someone "a fucking idiot" or something, then yes, I would agree that he shouldn't use that kind of language, but I think you'll find that nothing of the sort is happening, so there's no cause for concern.