Morals and Ethics

Talking about morals and ethics made me think more about how in certain situations we are persuade or we talk ourselves into doing something that we strongly believe is wrong. For example, when we don't feel or aren't in the mood of going out with people we tend to say a "white" lie like my mom said that I couldn't go or something came up. If we think that is wrong and immoral to lie, why do we do it some times and call it a white lie? In my opinion I think that we used the term of "white lie" to make us feel better after lying and now a days it has just become harder to always put our morals and ethics out there because people are easy to judge, separating themselves from us because they don't believe in the same things as one might do. They can see you as a good friend, person but after they disagree with your point of view about a certain thing they suddenly turn their back on you.