Agreed. This sounds good but immediately falls apart at the first scrutiny. It’s the same with “Don’t be a dick.” Everyone nods their heads and thinks, “Oh, that’s so obvious!” Of course, everyone agrees because they’re imagining what they believe is ‘evil’ or ‘being a dick’ and just assume everyone else agrees. Imagine their surprised-Pikachu face when they learn that other humans use different criteria.

But, if you think you can sum up thousands of years of ethics and legal theories with one pithy sentence, then go for it.