Why do Muslim Governments not allow Bibles to be distributed?

If Islam is so good, then why do Muslim Governments not allow Bibles to be distributed?

It is a fact that many Muslim-majority countries do not allow competing religions to freely and openly practice their faiths. Many place restrictions on proselytizing. 
If Islam is so great, then why are these laws in place?  Islam is therefore not clearly better than other religions, otherwise they would not do this.

I have heard two answers to this.
One blames the Muslim governments. 
The other explanation says that Muslims, while they believe the Bible is corrupt, still believe it contains portions of original truth and therefore the Muslims need to make sure that those portions do not end up in the hands of people who would not treat those books with the respect that should be due them.

The bottom line is that this sort of behavior demonstrates the true nature of the origins of Islam: it was started by the sword and is still perpetuated by force.