Why facial scarring persists as lazy shorthand for Hollywood bad guys

From Bond to Star Wars, Frankenstein to the Avengers, cinema has a troubling history of identifying evil characters by giving them welts, blemishes or scars It's as old as cinema itself: if you want to drive home a bad guy's nefarious nature, give them a big facial scar. From Darth Vader to The Lion King's imaginatively named Scar, for as long as films have existed, film-makers have conflated disfigurement with mental instability or malevolence. The trope is still going strong in Avengers: Infin...