errr....come on what?
It's a near-certainty that if he had put his hands in the air when challenged by the police in that tube carriage, he would not have been essentially executed by SO19 police officers who were looking for action in a city that was in mild panic, and who had been led to believe that de Menezes had definitely been ID'd as a potential suicide bomber.....
From the moment he was thought to be a suspect that man was dead. Nothing he could have done would have saved his life. It was, as you say, a panic situation, and there is no excuse for it, IMO. Putting his hands in the air would have done nothing, because they had convinced themselves he was a living bomb. But that was not a typical situation in the uk, as I am sure you agree. I hope that his death helps to make sure it never will be