At least a sixth of the commandments haven't been followed by anyone since 70 CE.

(Context: many commandments relate to rituals performed at the Temple in Jerusalem, which was destroyed by the Romans https://en.wikipedia.org/wiki/Second_Temple )

It's not just the Law; it's also a good idea.

This applies to non-religious people with their ethics/morals/facts/etc as well.

As with faith, sin also comes in many forms, from a semiotics perspective. But, one is probably best of not getting into too much detail as it can interfere with living one's best life (of which high self-esteem is a crucial component).

Well, that's certainly a popular opinion lately.

You’re conflating personal morality with group morality.

As an individual, you should strive to always follow your moral code.

As a member of a group, you should accept that everyone is fallible — including and especially yourself and your ability to even define what constitutes fallibility.

There is much to lose and little to gain by ostracizing others for their immaterial human failings.

The HN analog is Postel's law: "be conservative in what you do, be liberal in what you accept from others".

The perfect is the enemy of the good. The way to Hell is paved in good intentions.

Just two obvious thoughts that may be relevant in this case.