Casey Anthony Vs. Amanda Knox Case?

The injustice of every thing just gets to me, makes me so mad. Casey Anthony is being let free not guilty of murder, because of lack of evidence. which sucks, because she was obviously involved, but that's life. not enough evidence to convict beyond a reasonable doubt. and over in Itay, Amanda Knox has been in jail for over 3 years now, convicted of murdering her room ate. and if you look into that case, its a joke. there is nothing, no evidence against her at all. she is obviously innocent. and she stays locked up. while some one who is more than likely guilty walks away free. yea, and i know the justice system over in italy is different than in the us. but just all seems so unfair.