All muslims should be required to give the FBI a full set of good prints! Sounds like this wouldn't have happened it they had had them.
Fingerprinting gunowners will never solve any crimes or prevent any deaths. I don't see how having all muslims prints will stop anything.
Are you completely naive or just plain dumb?
1. They had a complete set of good prints of him from military service.
2. The first thing they did when they arrested him was to take yet another full set of "good" prints.
Neither of these sets of prints prevented them from holding him based on their own mistake.