Leave The Lies To The Liars

Everyone says: "Once a liar, always a liar."
But is it really true?

Personally, I used to lie...ALOT. But the past few years I figured that there's no point in lying if I truly have to go out of my way that much just to make sure a specific story is true - or makes sense. Obviously, telling the truth is so much more easier, and I don't really do anything wrong anymore...so there's truly no reason for me to lie. haha.

But the people who lie and lie and lie....and lie about the smallest things ever.
My brother for example. He will lie about taking a freaking cookie. "You've got the chocolate all over your face, and crumbs all around you, sorry bro...but you're not getting away with that one."
No matter what...he will continue to make up an entire story.

For reals this time...I don't really understand as to why people lie so much.
Let's say you've had a history with someone and you get told information from some close people and then question the former...important person about that information...but they lie, and make the explanation seem so believable, and they frame themselves as such a "perfect" person...until you remember the evidence you have to "back up" what they just told you.
Then finding out that they lied about something so little just seems to be so frustrating. Why go through that much trouble just to create a lie?

I could stress about it so much as to ...Why.
But for now, let's just leave the lies to the liars and not get wrapped up in their games.
The less drama. The better.