> The user never specify the goal clearly enough for AI system to work.

This is sort of a fundamental problem with all AI. If you tell a robot assistant to "make a cup of tea", how's it supposed to know that that implies "don't break the priceless vase in the kitchen" and "don't step on the cat's tail", et cetera. You're never going to align it well enough with "human values" to be safe. Even just defining in human-understandable terms what those values are is a deep existential question of philosophy, let alone specifying it for a machine that's capable of acting in the world independently.