There was not need of him saying anything. What Graham did say was not very Christ like. IMHO, he is poor representitive for Christians.
I agree that there is a time to be silent. However, I respectfully disagree that Graham had any obligation to in this instance. I also find the man very very Christ like. He can represent my version of Christianity any day of the week. (my husband has worked his crusades before and even considered going to work for his ministry "samaritans purse" but they didn't pay enough). He's a wonderful Christian and is simply preaching the Gospel - Christ crucified. It is not an all inclusive message, but it is not the message of Jihad Islam is. (and I defend the right of Muslims to believe whatever they want).
You have no idea what Christ is like.
He was always blunt, and truthful, calling a spade a spade. - He challenged the Pharisees on every encounter, accusing them, and rebuking them. - The truly repentant, he blessed.
Graham is following his example very well IMO.