Thank you for awesome comment @guruvaj

Humans will have a natural distrust about computer, they will be scared to trust their lives in a mere robot, without a panic button for manual override.

That's true. However, some experts predict that we will be able to trust AI in a short period of time. They claim that once strong AI is developed humans will be creating relationships with it. There will be also AI-based psychological robots. If we learn how to control strong AI, it will be definitely more predictable and patient than AI human, which makes it more reliable.