History doesn't remember reluctant heroes, and nor does he. But when one steps through the door like a woman out of her time, he has to recall that sometimes heroes are born out of street alleys and beaten paths too.
The end of the world sounds better when you're friends with a hero.
Minvera McGonagall could not stand to watch Albus make this mistake. Harry would not grow with the Dursleys. He would grow with her.