Muslims are not born evil. Ideas, including religion, are acquired. For Muslims those ideas are laid down in Islamic Scripture. If we study their meaning we start to understand why Islamic morality is vastly different from other religious or philosophical systems.
UPDATE: This blog started tongue in cheek, but it actually sheds light on moral issues that are not understood in other cultures. Like the one posed here. Why did Muslims protest the Mohammed cartoons, but remain silent when their religion of peace causes outcries like this? Simple. The girl is a devil worshipper, and in the eyes of Muslims the dredges of the dredges. Moreover, she's a slave: the justification of sex with slaves is covered in Scripture. So there's no moral problem here.