Moira was fatality'd the most. Beast has done morally questionable things in the past, also we have Dark Beast as a reminder of what he could become. Moira has never been anything but an ally, a friend, and even a surrogate mother to certain characters (I am so stunned they never brought Rahne/Wolfsbane into the storyline in any capacity throughout the Krakoan Era).
Nothing about what Backwoods Ben Percy did to the character makes any sense, even today as Kieron Gillen tries to clean it up.