Unnecesary division

[Kaaron]

I think the distortion begins,  when we see STS as "dark".
Sometimes the brightest, most self assured person in the room, is STS.
It doesn't mean "selfish at the expense of others".
[...]

Just wait until that person concludes that you are an inconvenience or an impediment to them in some way.  Then the sheep clearly separate from the goats.

They will relate it you in whatever way is conducive to their goals, plain and simple.  If being nice does the trick, great.  If they feel you've crossed them, they will destroy you without a second thought.

In a dualistic hierarchy, yes.
Do you not feel that it's within the realms of possibility, for someone to be content within and be self loving, without caring what others think of them?
I'd say you can structure your reality, without subscribing to the philosophy of hierarchy.

I think all configurations are possible, but that's besides the point.
I'd interject that it's the point, exactly. It means that not all who are serving the self, do so at the expense of others.
My point, is that your interpretation of what is possible, within the realms of STS, is dualistic and incomplete. Most here think all STS are beings who suck life out of others to fight their way up the ladder of domination. This is simply not true. It is an option, but not the complete range available nor the wholeness of the experience.
Among those possible configurations are people who are exclusively loving of themselves and would not spare a moment's thought before using or destroying anyone who gets in their way.  Their empathy circle is only big enough for themselves; other people are pawns.  Look into psychopathy as a trait.  That's STS.
Look into Autism, they're STS also.