well the truth thought can be used as it benefits everyone, no one loses out from telling the time. Yet lying about other things can advantageous to one party and so the cirumstances would say it was ok to lie, such as fraudsters, the gains out weigh the moral implications and so the morals are lost. I'm not saying this is how i work as such, but i'm sceptical of people who say that they couldn't morally do something, until they are faced with that situation how do they know?