Extrajudicial killing is always wrong, and we should be critical of Obama, just as we were critical of Bush.
Yes, Bin Laden was evil, but sending SEALS to kill him, even if he was unarmed, is behaving exactly the way Bush/Cheney did. They were wrong then, and Obama is wrong now. What would the harm have been to capture Bin Laden and put him on trial?
What is everyone so afraid of?