No, they're not entirely unsuitable for urban areas. Instead, their (relatively) short range means that they're unsuitable for anything except urban areas.
If designed poorly, they would be very unsafe, but there are plenty of ways to increase the safety. For example, notice that the drones have more than 4 rotors. This gives a bit of redundancy so that a motor can fail without causing the drone to crash.
If designed poorly, they would be very unsafe, but there are plenty of ways to increase the safety. For example, notice that the drones have more than 4 rotors. This gives a bit of redundancy so that a motor can fail without causing the drone to crash.