A Saudi mother's protest

A news item was published in a newspaper that a Saudi mother defied ban on women drivers in her country to set an example for her daughter and her friends. The woman, a housewife in her mid 30s, drove non-stop for four days on the streets of the Red Sea city of Jeddah to defend her belief that Saudi women should be allowed to drive. Even not fearing the arrest she was offering driving lessons for other women.
However, I don't understand why Saudi government has imposed ban on women drivers. They should realize that any sort of undue restrictions, tightening rules or bans temporarily can suppress the people but accumulation of much little suppressions would make the people firstly defiant, secondly impatient, and finally revolutionist.