Uber, Lyft, and SideCar are actually MUCH safer than a regular taxi. With a regular taxi, they are allowed to pick up any person who wants a ride. Off the street, anywhere. That's random. However with Uber, Lyft, and SideCar, this is not allowed. Fares are ONLY allowed to get a ride if the request a ride within the app, which brings me to another point. Money.
With a regular taxi, you can pay in cash, credit, debit, whatever. That way, you EXPECT the driver to have SOME money from a fare throughout the day right? Some people still use paper money, which is easy to steal because it's physical.
So, someone off the street can easily rob the driver, but a gun to him and get out, right? There goes his money. However, with these services, Uber, Lyft, SideCar, Physical money is COMPLETELY taken out of the equation, so when someone gets in the car, they don't expect the driver to have much money at all, because everything is done within the app. No physical money is required.
And if something were to happen, you basically have all the information on the driver, and the passenger within the app. You have their first and maybe last name. Phone number. Vehicle make, model, year, color, and licence plate number, within the app. Say, if the driver wants to rob the passenger, the passenger already knows the basic information about the driver. Easily send an email to Uber, Lyft, SideCar, and say, hey, this guy robbed me.
I feel safer with these services, because they are less random, and more predictable than any taxi.