Nobody is saying theres nothing wrong with what happend, but more that nothing can and will be done about it.
There doesnt seem to be any rules DM have to follow, and since they roleplay as gods in game, they basically can do whatever they want. While its fully understandable you want to stand up and say something when you feel you're being mistreated or when injustice is done, it doesnt help at all and might only get you in more trouble.
Its basically the price of playing on ns, you get a nice world to play on with a great community, but the downside is that you somehow need to find a way to not get too pissed off by DM doing stupid stuff.
from my own posts its clear I havent found a perfect solution for that too, so when you do, let me know
Ofcourse we can always hope DM Kim realizes DM are part of the community too and instead of just trying to make the community behave and act the right way, maybe the DM can act the right way too and lead by example.