People lie

Messages which are knowingly incomplete, false or both at the same time.

Why?

Because they have no alternative, want to achieve something or need to survive.

As soon as a person achieves a certain level of self-awareness – read consciousness, they realize that no ‘communication event’ will ever be complete. That nobody will ever be able to communicate everything they know, about the most insignificant subject, to anybody else.

Then what? Stop talking?
Or assume personal responsibility for everything that leaves your lips?

As soon as a person achieves a certain level of self-awareness, they realize there’s more in life than mere survival.
As soon as their consciences bloom – in concert with the accrued influence exercised by the ‘environment’, individuals set goals for themselves. Which goals become integral part of the ‘ongoing project’. Of the self-actualizing conscience. Achieving, or failing, each of those goals leaves an indelible mark on the conscience itself. On the manner in which each individual relates to their environment.
Since achieving is far more ‘satisfying’ than failing, conscience is naturally biased towards ‘achieving’. If the ‘environment’ ‘allows’ it, the bias becomes more and more ‘slanted’.
The messages used by the individuals – by their conscience, to be more precise, will increasingly serve the purpose of achieving goals rather than the purpose of ‘honest communication’.

As soon as a person achieves a certain level of self-awareness, that conscience wants to survive.
Mind you, not the person but the conscience.

‘?!?
Conscience cannot exist without the mind/body which supports it….’

OK, tell that to people who believe their souls are going places after their mortal bodies expire. Then try to demonstrate to yourself, honestly, that those people are wrong. That there’s no chance for their belief to be ‘true’.

But metaphysics are hard.
Let me give you a far lighter example.
Smoking. Or drinking. Driving fast. Eating that extra piece of chocolate…
Don’t tell me you never did anything ‘foolish’. That you never lied to yourself: ‘This cannot happen to me. Chances are so small that … Only this time….’

‘But otherwise nobody would ever be able to ‘leave their houses’. We’d be all completely paralyzed with fear…’

Yeap! That’s exactly what I mean. Conscience needs to lie to herself in order to remain functional. Otherwise she would not allow the physical body who sustains her to assume any risk.
They would both suffocate.