Magneto doesn't work as a hero specifically because he's caused untold damage and countless deaths.
To recount:
>Attack on Cape Citadel missile base, 1963
>Conquest of Santo Marco, 1964
>Attempted to nuke Santo Marco, 1964
>Attempted to nuke New York, 1964
>Led various Brotherhood attacks on the USA, 1964-1965
>Attacks on international shipping using a giant magnet, 1964
>Kidnapped Angel's parents to harvest for DNA to create a slave army of mutants, 1965
>Attacked the UN, demanding they give him his own mutant nation, 1968
>Attempted to enslave all humanity with a mind control machine, 1968
>Forcibly transformed people of the Savage Land into mutates, building an army intended to conquer the Savage Land and then the world, 1969
>Allied with Atlantis to invade New York, 1970
>Attacked a research facility to steal an experimental power source, intent on using it to power his Universe Machine that would turn people into mutants, 1971-1972
>Attempted to take control of every nuclear reactor in the USA, to irradiate the country, killing most humans and turning the survivors into mutants, 1973
>Attacked the UN Building again, taking everyone hostage and demanding the world surrender to him, 1974
>Attacks a SHIELD research base to kidnap and enslave the smallest man in the world, 1977
>Attacked research bases in Australia and New Zealand, stealing equipment to rebuild Asteroid M, 1978
>Threatens to end all life on Earth unless everyone surrenders to him, sinks a Russian submarine, killing it's crew, destroys the city of Varykino by creating a volcano inside it, 1981
>Put on trial for his crimes, used a mind control device to compel a court to set him free, 1987
(1/2)
