Could Saudi Women's Driving Protest Usher in Social Reforms?

Why does Obama and Hillary Clinton defend the repressive regime of Saudi Arabia.
US historically has ignored any human rights violations in Saudi Arabia and other important allies -America more concerned about oil than human rights per usual.
Why does Obama and Hillary Clinton mum on the rights of Shia Muslims and other non-Sunni Muslims or other religious groups in Saudi Arabia including Christians , Bahai, Buddhists etc. ???
Why are the US and Canada and Britain more often than not supporters of brutal antidemocratic regimes around the world? Riddle me that ???