Magneto wasn't a Holocaust survivor until Claremont took over the character, and it was Claremont who also had Magneto first join the X-Men. So his whole "schtick" wasn't really even a thing until the guy who first turned him into a hero introduced it after the fact.
And Emma became a hero back in Generation X, well before she started hooking up with Cyclops.
While I admit Magneto and Emma Frost are iconic X-Men foes, at this point I have no interest in seeing either characters backslide back into villainy. Both have grown far too much over the last several decades of comics.