Without a human driver, how will a cab company keep fares from trashing cabs? The issue of ensuring payment becomes a serious problem. Do you put credit card

Without a human driver, how will a cab company keep fares from trashing cabs? The issue of ensuring payment becomes a serious problem. Do you put credit card entry pads on the outside of the cab to prevent any of that? How long until someone superglues it? With human drivers, there's a social norm to prevent misbehavior, and in extreme cases the driver can stop and insist that the passenger get out. Even if the cab companies put human toll collectors in driverless cabs, although that could work, there would be less respect for cabbies who are not driving. I fear that bad behavior would still flourish.