Good point, that was definitely a jump in Alistar's reasoning.
I can somewhat understand in that you are disgracing the title of Grey Warden by allowing Loghain to join and how this can hurt their image later on. But at the same time that's hardly worth killing Alistair or the warden over. And the Grey Wardens are also known to do whatever is necessary.
In the end though, he is still humans. Humans will make a mistake may they be hardened or not, he won't become mistake proof by being hardened. Personally for that reason I think the best outside is to play as a female human noble, and marry Alistair so you both rule.
I can somewhat understand in that you are disgracing the title of Grey Warden by allowing Loghain to join and how this can hurt their image later on. But at the same time that's hardly worth killing Alistair or the warden over. And the Grey Wardens are also known to do whatever is necessary.
In the end though, he is still humans. Humans will make a mistake may they be hardened or not, he won't become mistake proof by being hardened. Personally for that reason I think the best outside is to play as a female human noble, and marry Alistair so you both rule.