Friedman hits the politically-correct notes about what a tragedy it would be were Western governments forced to essentially quarantine Muslim populations due to the murderous viral epidemic running through them, but...
Sometimes selfishness is reason enough to act.
True enough, an end to Muslim immigration to the West would impose hardships on many Muslims seeking little more than an adequate avenue for economic success. But there are other hardships that must be considered as well-- the hardships we all experience when our daily lives are disrupted -- or, more than disrupted: snuffed out like a candle-flame by a blast of explosive-driven shockwave wind -- due to our continuing attempts to do the "right" thing rather than the "easy" thing.
But we will not persist in doing the "right" thing if we do not sense some serious attempts in the Muslim communities to do the right thing as well. If Muslim communities continue to softly support these murderers, the easy thing to do will in fact become the right thing to do.
Even us backward, racist conservatives do have some attraction to the liberal dream of different races and religions living in harmony and forging a better future together. But this is looking more and more like just that -- a dream, and only a dream -- and if Muslims cannot or, more likely, will not restrain their most vicious thugs and butchers, than the non-Muslim host populations will feel less obligation to restrain their own most selfish impulses.