It’s 2015, people. Time to leave behind the ableist storytelling shortcut that injury / disability = ‘evil’ / ‘wicked.’ Examples of this include the character "Scar" in "The Lion King"; the bad guy in "The Sting," who walks with a limp; Dr. Strangelove; Captain Hook; the bad guy in "Casino Royale," with a glass eye, and on and on and on.
Filmmaker’s and storytellers do this because it has traditionally been a powerful way to ‘establish character’ in milliseconds. It’s now time to do better, and establish character through ACTIONS, not injury / disability.
On a related note, there’s a lot of looks-ism (aka lookism) in how looks and attractiveness are used to signify good / bad character. Time to kick that shit to the curb as well.