Originally Posted by
Iron Maiden
Why not? even though his victims have been an unsavory lot he's still a ruthless killer. The law doesn't care if it is justified or not but he's become like the Punisher. You'd still need to prosecute him as a serial killer. But this being the MU and the cops don't really go after the Punisher that much they won't go after him either...unless S.H.I.E.L.D finds it necessary to take Magneto down at some point.
Seeing as all his scruples were tacked on by Claremont much later he's better suited as the fourth option.