The "professional" under capitalism does not concern himself with the social consequences of his daily work; hes just doing his job within whatever constraints might exist at any given moment. He "carries out his orders" no matter what they might be. So, if he is ordered to apprehend a random sniper on a killing spree, he works as hard as he can to do that. If he is ordered to round up the jews to be executed, he works as hard as he can to do that, too. To him, its all in a days work.