Who is worse: melissa huckaby, casey anthony or amanda knox?

i would have to say casey anthony and melissa huckaby are tied for first place on my evil meter. don't get me wrong they are all bad but the amanda knox case pales in comparison to these other 2.casey anthony for killing her own kid for no reason and melissa huckaby for raping and killing another's child.no children involved in the knox case nor was she the only perpetrator, so to me amanda knox isn't anywhere near the same scale as anthony and huckaby