Many have pointed out that the fight took place at the end of a very long night of partying, and Solange may have been drunk at the time of the event. Reactions from those around her suggest this sort of thing happens often.
The way Beyonce seems to quietly accept and maybe even approve of Solange's attack on her husband has led many to believe the power couple is having problems. Was Solange simply standing up for Beyonce?
Some have pointed out that Jay's body language in the security cam footage suggest he finds the attack humorous. The very few times Jay and Solange have been photographed together seem to suggest the in-laws aren't exactly close.