Our culture encourages white lies. For example, a man's wife asks him if she has a big backside, "Er, no, dear - I like a woman with a bit of meat on her bones." He might well think she's becoming grossly overweight but he's not going to tell her that. Not only would domestic peace go out the window, he would feel he'd been cruel. She would feel hurt. This is not win-win but lose-lose.
Both responses, of course, come from fear of the truth. So telling a white lie is a compromise, a rationalization. So until every one in the world agrees that white lies are out, it's better to stay with the status quo.