Muhammad chose the most beautiful girl from the tribe of Huyayy to be his wife.  He had her father and brother executed, and her husband Kinana tortured by fire to find his treasure.  In one tradition apparently Saffiyah hated Muhammad more than anyone else, because he killd her family members.  Do you think it was a good idea to marry her after killing her family members?

All of these facts are from the Islamic sources themselves.  Listen to Ismail explain the problems with this story: