I see that the lie comes from many different motives. The world - and people - are much, much more varied and complex than you seem to credit. I like to treat each person as an individual.
Yes, there are those who lie because they can't handle the truth but these usually lie to themselves. I would class most religions in this category but that's another story.
There are those who lie - and I know because I place myself in this category - because [b]others[/b] cannot handle the truth. I do believe that the old saying "where ignorance is bliss, 'tis folly to be wise" is just so true. We've all swallowed the Father christmas and Tooth Fairy stories and they are just lies! Bastards! We lie to our children.
We carry on lying to our children. We teach them a little history. When they get older we revisit the subject and expand - "well, what we told you before isn't [b]strictly[/b] true" - the real story is...(more lies) If they get to college and study history they may well get a little closer to the truth. And then again, maybe not.
The whole world is built upon lies - "cigarettes don't cause cancer" is quite an amusing one. I won't get into institutional propaganda about "the war on terrorism" or "global warming" as it's pretty obvious what point I'm making.
I could go on but I won't.
I lied. I will...
One of the most aggravating people that I ever knew was a salesman colleague - and once friend - who became a born again Christian and from that point never "lied" again. (I put lied into commas to make the point that the definition of a complex lie is personal and open to much debate).
At this point in his life he became - to an outside observer - an immensely self-satisfied and smug individual who would never hold back from "the truth" regardless of the recipients need or desire for this information. He was only saved from mutilation at my - and other - hands by the fact that he was fired.
I'm quite an empathic person so if lying will make someone feel better - and, YES, I do weigh up the long as well as the short-term consequences - I'll do it.
Edit because...I'm not going to tell you!