Col. Yusuf Al-Qahtani, spokesman for police in the Eastern Province, said that women are not supposed to ride in cars without male guardians.
“They should in the least be accompanied by another woman. If the Commission for the Promotion of Virtue and the Prevention of Vice sees a woman in a private car with an unrelated driver, they would arrest her for being in a state of seclusion (khalwa),” he said.
So, the understanding is that women are responsible for keeping themselves in safe situations; if they do anything that might compromise their safety they deserve what they get.
Sounds like a Saudi version of "she was asking for it".