HOW CAN YOU BE EVIL WHEN YOU'VE GOT A SMILE LIKE THIS! (THOR ASKS YOU IN HIS BOOMING ALL-CAPS VOICE)
I saw Avengers last weekend. Twice. I'm ruined now.
But seriously. You can never convince me Loki's 100% evil, not with a smile that could dim all the lights in Valhalla and have every fat Valkyrie belting out tear-jerking opera melodies with just a fleeting grin.