As revealed by what they say, only some Muslims are deranged.  However, all Muslims follow a deranged belief system.  If you follow a deranged belief system long enough, you will likely become deranged.  For this reason, Muslims should not be allowed in the United States.

Now, to prove Muslims follow a deranged belief system, just ask a Muslim how Muhammad could be a mass murderer and still be a prophet of God.  If you do ask a Muslim this question, be sure you have gun-carrying security with you.