In the film, Nolan put a true emphasis on Joker's sinister ways, they made him the true opposite of the dark knight, the true embodiment of evil. You may view that as fear inducing, but what is truly fearful for everyone? Take into account Johnathan Crane's psychological prowess, his knowledge of the human mind and his ability to find one's true fear just by talking to them. His fear toxin adds to this, and for that Scarecrow is truly fear inducing. yet don't forget Bane. Bane led a terrorist group, he made gotham and the country shiver in fear. He was ruthless, and was willing to do anything for
Bane was a great villain, he was fear inducing, but he had a massive weakness.
None the less, I choose Scarecrow. I leave you with the scariest thing you will ever hear in Nolan's trilogy.
[video=youtube;mWyB447vNjg]http://www.youtube.com/watch?v=mWyB447vNjg&feature=related[/video]