MG,

Williams said he "felt" unsafe when he saw people in "Muslim garb," people who had passed through airport security in "Muslim garb."

All of the terrorists who have attacked US planes have not been in "Muslim Garb."

Williams expressed fears were completely irrational and unfounded.
Considering what he said next about Timothy McVeigh and others, I doubt that the "fears" were even honestly expressed. If they were he would have said that he DOES fear all white men with crew cuts because of McVeigh.

He was making a rhetorical point about prejudice, he introduced it by saying "I am not a bigot." then clearly saying bigoted things.   

He did not help the cause of the fearful. He helped justify Bill O's projection of fear.