The former members of the 9/11 Commission warned Monday that the U.S. is dangerously unprepared for another domestic attack. “Are we safe? The answer is, of course, that we are safer but we are not safe. Four years after 9/11 we are not as safe as we could be and that is simply unacceptable. Look at this report card, there are far too many C’s D’s and F’s in this report card the we are going to issue today,” said Thomas Kean, the president of the now-disbanded 9/11 Commission. “There are many things, as I went around the country and talked to people, there are many things that people think have been done that simply haven’t been done. Our leadership has been distracted in this country. Some of the failures are shocking.” The commissioners gave the government a grade of C D or “F” in about half of the categories including Fs for its efforts to focus homeland security money on cities most at risk, on improving radio communications for emergency workers and on prescreening airline passengers.