Why telling a lie is so bad?

I think generally we all lie to some extent.
Politicians, sales people, business people name a few.
Some times we lie to the employer when we need to take a day off.
Then there is so called white lies.

But according to Buddha they all bad.
Why?

This king’s bull-elephant has thrown away his life, there is nothing to be done now for the king’s bull-elephant.’ Even so, Rāhula, of anyone for whom there is no shame at intentional lying, of him I say that there is no evil he cannot do. Wherefore, for you, Rāhula, ‘I will not speak a lie, even for fun’, this is how you must train yourself, Rāhula.>

https://suttacentral.net/en/mn61

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Maybe this sentence in your quote, gives the reason:

with metta

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