> don't bother trying to be nice to those people

I don't think it's saying that; it says to accept their nature but says nothing about giving up on being compassionate. I think 10 is necessary before you can do 9: before you can treat people with an invincible kindness you have to accept that you have no other action (as the other action is tyrannical).

I think stoicism fundamentally is about the process not outcome: we're not kind because we want to change people (outcome), we're kind because that's the only course of action we accept as legitimate. Yes, we might change people, but that's not why we do it.