The fact is, it doesn't take too many to kill or wound dozens of people.
Think Fort Hood. Nobody thought that after this man had joined the service and been educated he would choose to act in such a violent way....but he did. Why?
If being here, being educated and in the service didn't prevent his getting out his gun and shooting at fellow officers, what will it take?
There is in fact, pockets of Muslins that our government is watching because of the threat they pose. Why give them more numbers for us to have to watch?
There IS a valid concern here, when so much violence is connected to this religion.
By that rational we should be watching anyone with overly religious tendencies. Timothy McVeigh was a Christian fanatic, should we be watching all Christian's too?
Don't let fear ever be a deciding factor in any rational decision. Besides you're way more likely to get killed in a car crash or even struck by lightning that being killed by a terrorist.