Lying has been a Common Human Practice

Once we learned to talk (a massive achievement only we have been capable of) there was no need to also be truthful. 

And this was encoded in our laws. Finding the truth is a hard job, and is usually incomplete. 

This is the advantage of using a Computer. If I say a=1, it remains 1, until I change it. 

We can make a truthful Computer (a Functional Computet) but we but we have to make it that way. A computer that can change its mind easily is more useful for us. But it has to be tested frequently to see if it is giving us thr right answers. 

There is even a technology now called Deep Learning where the Compter learns how to program itself! We don't know how this works, but everytime we use Google Translate, we are putting it to work.