DeBlasio didn’t have much to do with sheltering islamics after 9/11 (unless he did privately). We can blame Bush for that.
http://www.nydailynews.com/new-york/nyc-crime/dead-gunman-home-depot-truck-runs-bikers-article-1.3602094
the NY Daily News reports the perp was Arabic and was heard by witnesses shouting Allahu Akbar.