Stepsis's date w/ a bully

Your stepsis Angela is excited about her date w/ a "bad boy", w/ her naively insisting that the rumors of him being a violent womanizer are exaggerated. She gets angry when you try to dissuade her from meeting "bad boy" Brad, w/ her insisting that prejudice against people is wrong. Will you persuade your stepsis to stay away from this asshole Brad guy...or do you feel your stepsis needs to learn this lesson firsthand? NOTE: This doesn't work well in the free model, specifically in increasing the chances that Brad acts like an asshole, but works much better on Mars.