Question about Quincy Sharp

So I'm playing through the arkham series again and I finished Arkham Asylum 100% and then started up city. I guess I never realized back when I played it before but you find out Quincy Sharpe is the current Spirit of Arkham and then in the next game not only is he mayor now but also gets the green light for Arkham city.

Is it ever explained why batman never did anything once finding out he has been killing inmates and such?