How can people find Amanda Knox guilty?

After I looked into the details of her case, she obviously had an unfair trial and there seems to be no evidence against her..i don't even understand how there was even a case built against her, and why some people are so pionate about insisting she is guilty. Of course there is a possibility that she is guilty but all of the evidence points to the contrary..i mean the prosecution made a case about a satanic ritual? Common give me a break!