I mean, he did provide the information Dick asked for, so he made good on what was asked of him. He could claim that the bad info was fed to him. Personally, I don't even know why he'd want to go back to working for the government, after seeing how deeply corrupt it can be, but I know that he really is a lawman at heart. Besides, if he was working with Felicia again, that could precipitate lots of Alex/Lang awesomeness. (Huzzah!)
I call for Alex/Lang fic. Don't disappoint me.