Jamieson, Fausset and Brown on Genesis 34:8-10

8-10. Hamor communed with them--The prince and his son seem at first sight to have acted honestly, and our feelings are enlisted on their side. They betray no jealousy of the powerful shepherds; on the contrary, they show every desire to establish friendly intercourse. But their conduct was unjustifiable in neither expressing regret nor restoring Dinah to her family; and this great error was the true cause of the negotiations ending in so unhappy a manner.