He is not 'capable of' making those medical decisions himself. [=he cannot make the decisions by himself because he cannot think clearly, he is too sick, etc.]
I don't believe that she's 'capable of' murder. [=that she is the kind of person who could murder someone]
She is one of the most 'capable' [='skilled'] and versatile actresses in Hollywood.
(..) It feels good, yeah? No, but this, this brings it to a close. As soon as we find out what else this has been used for. I don't just mean weapons. Since when is Strucker capable of human enhancement? Banner and I'll give it the once before it goes back to Asgard. Is that cool with you? (..)2015 Avengers: Age of Ultron