At least 5 family members knew Mateen was planning an attack. A gun store contacted the FBI the week prior when Mateen tried to buy guns and body armor.
It is not only reasonable, but necessary for America put a temporary ban on Muslim immigration when 1 in 5 American Muslims REFUSE to rule out attacks on civilians to further the goals of Islam (Pew Research).
It seems a sizeable number of Muslims are not like us. Or want America to continue.