No don't think it is correct to do that, no matter how bad the person may have been. We should only pray that we do not one day end up in that situation.
Also I think quite allot of people tend to take everything that they are told as fact. I don't know the person Osama Bin Laden, and therefore can not take everything as truth when I am told so by the media and USA. Look at how many lies we have been told about Iraq and WMD, and there have been many instances of similar lies before and since the 9/11.
USA trained Osama to be what he is, just like many of the other dictators in the Middle East, soon as they stop jumping to USA commands they become enemies before that no matter how many people they kill - USA still treats them as friends. Take Mubaruk for example.