This realization helped them find a much-needed solution to the problem. Although Hera had mixed feelings about seeing this side of Luke, she knew that if she wanted to truly accept the male leads, she couldn't allow them to descend further into darkness or follow the path Alice had led them down in the original novel.
By following Alice's methods, she didn't truly help them become better versions of themselves; instead, she manipulated them. The novel might have portrayed her actions as beneficial, but if they had truly improved, why would they have destroyed a good family like the Averys just to protect Minerva, who was clearly in the wrong?