I disagree. It is not necessarily true that Steyn is being "illogical" by "ignoring" the concept of "separation". It may be that Steyn believes (as I do) that there is simply no such thing as "separation" in today's world. Many Muslims are already citizens of Western countries. Many more travel as tourists, students, businessmen, etc. Still others sneak across borders. It only takes a relative handfull to create havoc. The level of isolation necessary to achieve "separation" from the types of WMD that will likely be available to all wealthy people in a few decades' time is unattainable.
If that is the cause, then we have to folow Ann Coulter’s suggestion and no one has the heart for that.
So what happens when a million other Muslims sense the "Big Mo"?