Only the cutscenes are shown, not the dialogue beforehand, that's why it appears automatic.
Also, it might be that, if you give in to the urge too much at the beginning, then it becomes automatic.
actually, the dark urge is the murderer of blood in baldur's gate 15 years ago.
this means the dark urge has already obeyed his/her dark urge 15 years ago far before the beginning of bg3.
from this instance, i wonder if some of the origin characters are hard to gain an ok end, and are too easy to be leaded to bad ends?
