That’s not evidence at your link. It is someone’s summary of evidence and clearly their negative opinion enters into much of the summary. I don’t know enough about the case to say guilt or innocence one way or the other; but as an editor, I read for what is actually a provable assertion and what is a speculation, and the stuff at that link seems speculative by at least half.
http://www.injusticeinperugia.org/footprints-01.html
http://www.injusticeinperugia.org/contamination.html
Amanda Knox is Innocent of Brutal Murder, Retired FBI Agent Claims