To add a scaryness to Batman that he strikes in criminals should they add into the film shots like horror movies do, where the character doesn't see the bad guy behind him. A shot like a criminal robbing a house, suddenly we see some shadowy Bat-like figure walk around in the background and the robber has no clue and doesn't react. Like in the creepy movie the Others or whatever it was called. Or a shot like a blurry thing moves and the bad guy barely sees it and freaks out, spins around to see what it was. Or the guy passes the screen and we see he walks right past Batman and doesn't realize, or he opens the curtain and there is Batman sneering at him, and he jumps back in fear. Just replace the serial killer/monster with Batman. Sort of show that criminals are affraid of Batman because he is scary, and maybe it would seem scary but then the audience remembers he is the good guy, he is Batman.