“I’m tired of having my actions construed as instruments of US policy,” Superman said in a short story in the issue, Action Comics No. 900 from the Time Warner Inc unit DC Comics.
People have been asking why Superman would suddenly said that , but the line above clear clarifies it all.
Sometimes after a while you would notice that you are a blunt instrument of somebody or something. James Bond will always be the MI6's blunt instrument to do the jobs all around the world. For Superman, the realization is that it's a global scale job for him, not for one side of the continent and not doing for the other. It's the realization that you don't want to be a stooge for life and that's the blessing of having an own mind to think.