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.
(..) you leave the White House. These are the launch codes, verification codes, a listing of every classified location capable of launching nuclear weapons. In the event of an imminent strike, you can green-light it using this phone. It works anywhere on Earth as well as beneath it. (..)2016 TvShow: Designated Survivor Title: Pilot Season: 1 Episode 1