 Because you are trying to make it look silly.  In Christian history illustrated manuscripts became normal and flourished over time.  In Islamic history there was a short period in very limited areas where they existed and then almost altogether fizzled out (except for Iran).  Even when they were around the scope of their existence was much smaller than would be with their Christian counterparts.  Your argument seems to be that if something has any parallels to what Muslims believe then it doesn't belong in the article.  Now that is a silly view in my opinion.  Not to mention that most of these images will be a click away on the commons or on other pages where they are historically notable.  There are legitimate reasons not to use images willy-nillynot just censorship.     