It's much harder to say "I'm going to kill three of the biggest characters in your universe in a gruesome bloodbath." There can be a lot of differing opinions in a mainstream comic book, you know? "Rogue would never do this!" But I can say, "No, Rogue suffered the death of Charles Xavier and it broke her down and she stumbled into a dark place and she started fixating on the Scarlet Witch as the cause of it all" ? which, there is a logical chain of events that lead to the Scarlet Witch. And in the confusion, she thought Wanda was up to doing it again and she did what she thought was best.