Maybe this was intentional
I doubt Larian intentionally made the this Evil sub-path as poor as it is.
I also don't want to believe that their writers are simply and plainly bad.
As I said
there, I rather hope that, simply, they released the EA version without having had time to properly finish/polish the writing for this sub-path. And that it's unfortunate that they had also encouraged us to go Evil in EA, attracting lots of attention to it. At least, I hope they didn't do so out of pride for how they wrote Evil, but rather wanted to gather enough feedback for this sub-path, since it will probably be the case that most players won't side with the goblins.
