Genesis 34:19

And the young man deferred not to do the thing, because he had delight in Jacob's daughter; and he was more honorable than all the house of his father. No matter what the motive had been in defiling Dinah, Shechem now was undoubtedly sincere, and he accepted the words of Jacob's sons at their face value. His position of power and influence was such as to give his words much weight, and he lost no time in carrying out his intention.