You don't think the Muslims are gonna suddenly decide to play nice with others do you?
They will obtain (and probably already have - I'd say most of the reports on FR are true..) nukes. And when they have their tactics set, they'll use them.
In essence you're saying that we have to wait to lose a city, before we can retaliate.
Have you ever seen an Irish Wolfhound? Big, HUGE, really powerful dogs. Other dogs rush out to challange them, barking and snarling and most IW's will just look at them with a vaguely amused look. Someone trys to threaten you, they merely stand between you and that person, quietly watching with no raised hackels or curled lip. Yet I saw one of those quiet dogs reach up, without warning, grab a man at the shoulder and strip most of the meat off the bone. It happened so fast and was so effective, and utterly without warning. The dog knew who was a threat and who wasn't. You have to respect a dog like that. They handle their power well. That's what I'm talking about.