Everyone is not among the worst people you (or I) have ever met.

Not needing to be told that they caused harm is one of the things that makes them not among the worst people you (or I) have ever met.

Sivers' parable is about his (and our) interpretations of the past -- Sive.rs publishes parables not facts. Context is relevant, here.

Yes, worst people gonna' worst people. Sociopaths are not Sive.rs audience. His point is that we can't change the past and only act in the present. What the worst people you (or I) ever met did can't be changed. How it affects are behavior can.

Particularly when the worst person you (or I) have ever met is you (or I). Biss-ninny 101 stuff. Which Sive.rs (and I) study.