Sorry, I didn't mean to be jerkish- but I found it a weird question and wasn't sure if you were deliberately screwing with me. You obviously weren't and I misjudged it.
The purpose of such a ban is to compel conformity. The nature of controls on thought and speech rarely changes a person's "intent" immediately but instead get an outward appearence of observing the law. Generally, this works. So for example, you can have traffic laws to keep traffic flowing, but that doesn't stop road rage. Nor can any law prevent all traffic accidents. Rather the conformity in behaviour keeps the traffic moving and make the roads safer. It simply creates a framework for people to work around.
The reason I found your argument puzzling was because no law (or ban) can ever be 100% effective due to the physical limits on law enforcement. They can't be everywhere or control everything. I didn't accept the premise that a law had to be effective to be necessary or justifiable so your asking for evidence of it struck me as a bit absurd. It is simply that the ban is considered a desirable change in behaviour and therefore worth the effort of enforcing it. That is more authoritarian and perhaps not a common view.
So if you take an example like prohibition of alcohol in the US, it was never going to completely eliminate alcohol in the country but the outward change in behaviour was considered desirable. It however was disasterous for law enforcement because it gave big bussiness for organised crime like Al Capone, etc. However, if prohibition had eliminated alcohol from the US and turned that conformity into acceptence of the immorality of alcohol in the long-run (say over a generation) it would have been successful.
The point of banning of quran and the bible (aside from trying to get people to think outside the box) would be to get people to conform to the law and then create an oppurtunity in which new ideas could fill the gap.
Anyway- My bad for reading your message the wrong way. This is the first time I've suggested banning something in a debate topic on RF so I misunderstood the difference in our views. You could call that a blind spot I guess.
For the most part I would agree with you.
IF it was not religion you were looking to ban.
The thing is, people will believe what they believe.
The Bible and Koran can and have been used to guide said beliefs.
From what I have seen, mostly for the better, but with some times for the worse.
However, the worse is, IMHO, the exception, not the rule.
Seems to me, and please correct me if I am wrong, that your proposed ban is aimed more so to curb the extremists.
If so, I have to wonder how many non-extremists will turn into extremists to protect their beliefs?