We humans have a predisposition to compete, and in conversation that means we are pressured to exaggerate, distort, and lie. Thus, it requires practice, discipline, and focus for the average person to have a conversation without exaggerating, distorting, or lying.

I feel this is an opposite view to what is normal in our culture. People assume that they are hearing the truth unless a person has a reason to lie. The reality is, the average person will lie unless they have a reason to tell the truth. (This is why “fishing tales” start coming out when we start drinking, and the “truths” people share when drunk are always politically motivated. Booze loosens our inhibitions.)

Moreover, it occurred to me while sitting in my local coffee shop suffering a person talking non-stop, the more a person talks without pause, without thought, the more likely they are to be exaggerating, distorting, or lying. Especially if the talker is clearly not listening to the person they are supposed to be conversing with.

There is a nuanced, calculating skill to telling the truth. 
Lying is a reflex. 
Some people have better reflexes than others,.. 
but it is an innate animal instinct nonetheless.

The history of our political evolution to this point is nothing more than selective pressures applied to animal instincts and reflexes.