Lies are counterproductive. Truth does not feel comfortable with being twisted, and will eventually straighten itself out. This will lead to exposure of the original lies, and the fallout of hurt all around.
Even if the lies have not yet been deciphered, the liar’s spirit already bears the telltale wounds. The basic elements of spirit are love and truth ~ which cast a light that exposes lies. This is neither cruel nor judgemental: it is rather a cleansing that allows the experience of authentic communication with other beings.