Self-driving cars are not driving themselves, they are driven by algorithms. The problem is that cars then become prisons on wheels. Think about it - since you pay with a debit/credit card, your identity is known when you enter a car. You can then be driven directly to a police station and you can't escape, because the whole thing is controlled by centralized machines. Just look at what's happening to these people in China who are mysteriously disappearing. Vehicles driven by algorithms are the best tool for eliminating protesters, political enemies etc.