It is my guess that 1,400 years ago when Mohammed at the age of 53 married a six year old girl and then waited until she was nine to consummate the marriage, there was no thought that what he had done was evil or even unusual. I would guess that many men of that time and culture married what we would consider to be female children.
However today, in the year 2006, we realize that childhood lasts much longer than the age of nine, and that not only physical, but also emotional damage comes from sexual intercourse at such an early age. The problem, therefore, is that to the muslim whatever Mohammed did in his lifetime is to be considered right and good now, 1,400 years later, when it is obvious to any intelligent, educated, and moral person that sleeping–having sex–with pre-pubescent girls is outrageous.
So, until the muslim world can come to a consensus that some practices of Mohammed, while being culturally okay in his age, are now not right or good, there will always be a feeling of shame and a desire to hide the truth of this matter.