From my point of view, the trailer went hard, but let's not forget that some games like Diablo or Path of Exile had more graphic trailers (especially Diablo 4).
The push back from some may just be a start of constraining movement of art/story by "those weak of heart" who will never buy the game anyway.
And of course Larian may go too far, but if we will have Early Access like with BG 3 I think that We All can shape the story in a way where brutality isn't there just for shock value, but brings depth and/or have logical explanation for such.
I think that I speak for all when I say that We as Players want immersive and meaningful experience in RPG game.