I share this sentiment. Most in the west (especially on HN) have been conditioned to believe mercy must always be granted and justice is evil. You can’t have one without the other or society falls apart.
As a child of a mother who cheated and ruined our family, I complete agree with you. This story filled me with disgust, and I want to live in a culture where people like this feel guilt at what they did. The sibling response here is happy to tut-tut you with the weight of progressive cultural authority behind them, as only a short sighted ideologue could. Lying of this level is bad for the family and bad for society. Protecting it is akin to protesting the removal of a cancerous tumor.