I don't know, I kind of agree with Trump. That is, as long as we start with the corporate officers at Merck, Glaxo and all the other major pharma corporations. Look at the FBI's death stats—legal drugs kill way more people than street drugs. Using Trump's logic and actual statistics, Ian Read, CEO of Pfizer, has a much higher kill count than someone like El Chapo.
You mentioned the CIA and big, crooked banks. I agree, that would also be a good place to start.
Trump seems to love China's tough drug policies... so why stop with drugs? China also executes corrupt businessmen and politicians. Remember the tainted milk/melamine scandal? Folks were executed and given lifetime prison sentences for that incident. Remember the housing market/derivatives disaster? Executives were punished with bailouts and fat bonus checks for that one.