So, you can't just shift alignments on people because my action may SEEM like it is Evil in BG3, but it may actually just be smart. I'm SAYING I'm joining Minthara when I'm really pretending to join her to lure her into a more advantageous position for myself. Instead of 4 party members fighting Minthara in her home court, I'm luring her to a well-defendable gate with allies like Zevlor to help me wipe out her forces. So how is Larian going to judge my action of "Yes, Minthara, I'm going to help you"? Are they going to call that evil?
Well, lying is evil, no?

On top of that you endanger grove and tieflings out of concern for you own safety. Minsc and Boo wouldn't stand for that!
That is unfortunately common problem whenever RPG tries to "judge" players actions. As it is I am everyonce in a while irritated that companions take at face value stuff I say as a PC.