Hasan bought his FN through a local gun store. The same FBI that was monitoring his emails and other jihadist behavior also did his NICS check. There was no dropping the ball between agencies, the FBI f**ked this up all on their own.
Dude, you need to read the Fifth Amendment. It is unlawful for the FBI (or any other agency) to deprive you of your rights without due process of law. Due process being something along the lines of a trial.
Your post comes frighteningly close to what the leftists have been pushing for - on a watch list, fail NICS.
Freedom is dangerous. Freedom is often messy. But it's safer and cleaner than the alternative.