How about because she is an impressionable young child? At that age you may know basic right from wrong but there many things you don't know about life, society and what's taboo. That's the reason we don't hold children to the same level of responsibility as adults. She probably didn't even know what sex was before she met that old pervert. A 10 year old little girl deserves no blame here. If you can't see that then I must shake my head.