You cannot build an AI that has only the capabilities you want, because the algorithms that solve the problems you want generalize to the ones you do not.

The best and easiest-found-by-optimization algorithms for solving problems we want an AI to solve, readily generalize to problems we’d rather the AI not solve; you can’t build a system that only has the capability to drive red cars and not blue cars, because all red-car-driving algorithms generalize to the capability to drive blue cars.