Courage is about learning how to function despite the fear, to put aside your instincts to run or give in completely to the anger born from fear. Courage is about using your brain and your heart when every cell of your body is screaming at your to fight or flee - and then following through on what you believe is the right thing to do.
No one just starts giggling and wearing black and signs up to become a villainous monster. How the hell do you think it happens? It happens to people. Just people. They make questionable choices, for what might be very good reasons. They make choice after choice, and none of them is slaughtering roomfuls of saints, or murdering hundreds of baby seals, or rubber-room irrational. But it adds up. And then one day they look around and realized that they're so far over the line that they can't remember where it was.
It turns out that Molly wasn't her mother's daughter in that respect. Charity was like the MacGuyver of the kitchen. She could whip up a five-course meal for twelve from an egg, two spaghetti noodles, some household chemicals, and a stick of chewing gum. Molly.. Molly once burned my egg. My boiled egg. I don't know how.