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.