Under Italian law, IF Knox had been proven to have "[removed] the most visible traces of what had happened" to "help cover up for someone" or even to "steer away suspicion from herself" that would have been a crime in itself for which she could have been charged. But she wasn't. Why?
IF Knox had cleaned up to divert attention from herself, why on Earth would she have left her own blood on the faucet and "Sollecito's" bloody footprint in the bathroom and pointed them out to police instead of just removing them? It also makes zero sense to leave the mat with the footprint but wash the floor of any other prints. It's completely illogical.
How could Knox have stepped in enough of Kercher's blood to the extent that she left a full "bloody footprint" (according to Massei and the PGP) if "her contact with the victim’s blood happened in a subsequent moment and in another room of the house"? The only other places Kercher's blood was found in the house were Guede's shoeprints in the corridor/kitchen floor and on the bathroom rug. As Vixen is fond of pointing out, blood dries quickly and if Knox had stepped in a dried shoeprint, it would not have transferred enough blood for her to leave an entire bloody footprint. If she stepped on one of Guede's shoeprints while the blood was still wet, it would have smeared the shoeprint instead of leaving them intact as they were.