There is a huge and significant difference between burning a few books sa an effigy in denouncing something and PURGING every book in the country. No responsible people are calling for a purge AFAIK.
For instance, I own a koran (electronically) and I'll keep it and read it yet I support the burning of a limited number of korans publicly to make a point just as offensive to the muslims who support building a mosque at ground zero.
A bit of tit-for-tat defiance is appropriate and good in a real war. We cannot maintain our own freedoms by simply lying down and letting them overrun us.
They need to realize that it is not worth it to them trying to fight against us as they will not succeed in doing so. They won't get that message without a few pointed barbs in their general direction.
I recently heard an interview w/Robt Sopenser who correctly identified islam as a political movement (like communism) but uses the false image of religion to protect itself.
Is it worth it to you to do it then??