The one I'm sick of defending is Grey Worm "turning evil".
At least with Dany they sort of have an argument that it was rushed because Dany started out from a place of pure good and innocence and her turn was accelerated after losing her advisors. But Grey Worm?
Kills a baby in front of it's mother to rid himself of "weakness".
Meets Missandei, calls her his "weakness"
Loses Missandei, and with her, his weakness.
Burns her slave collar, her last posession, destroying his weakness that was, much like a collar, constraining the beast within.
But no, OMG he killed unarmed Lannister soldiers.
He killed a fucking baby before he got humanity, come on guys.