“Yes, vengeance is the Lord’s. That’s why the sons of Jacob killed Shechem, Hamor, and all the men of military age in their city, then took the women and children captive, all because Shechem took Jacob’s daughter Dinah for a test drive before asking for her hand in marriage.”

Two points:
1) He FORCIBLY took her for a test drive, as you phrase it. I would be a mite cranky if someone raped my sister, wouldn’t you?

2) Just because the Bible tells of an action does not mean it endorses it. The Bible relates an awful lot of wickedness, and doesn’t always have a whole lot of editorializing about how bad it was – Classical Hebrew is a pretty spare language and doesn’t waste many words. The reader is expected to be able to make those judgements based on other sections of the Bible.