It is an ethical minefield for Larian to point at Minthara and advertise her to players as a reward for playing evil, to then discover that the only unique thing about recruiting her that way is being rewarded sex with a victim of mind control for slaughtering children. And I don't think they navigated that minefield without stepping on any mines. Like yes she has the line about it being what she wants and that's a good way for the writers to cover their asses to avoid the absolute worst implication of the scene, but that doesn't change the moral implications of the circumstances or the fact that she is still suffering from the mind control directly before and after the scene. It's bad. It's messed up, more than just being an evil thing to do.
None of which is to say she isn't one of the best characters in the game, she absolutely is. Just in my mind her scene and Halsin's Act 3 "romance" crap call a lot of things into question.
You're overcomplicating and making it up. Already looks like a conspiracy about writers who cover the truth. Besides, you didn't kill any children in the grove, goblins did this.
"Ethical minefield" sounds so funny, it's a game and in my opinion most evil choices in the game can be justified by your character pragmatism (if you can give up your morale of course), including raiding the grove.
