Maybe “Infidel” will inspire a generation of Muslim teenagers to study, work hard, join the mainstream — and then say what they think and spoil the political consensus. Either way, I’m not sure that the impulse to dismiss Hirsi Ali for her lack of utilitarian value reflects well on those who do it. Nor does the underlying assumption: that religious faith must be respected and defended on behalf of the dark-skinned immigrants who live among us, even though we natives no longer seem to require it.