I have no in depth knowledge of this case but find it hard to believe that every court in Italy is entirely biased and out to get these two.
What is some of the most compelling evidence AGAINST them?
For evidence against them, I found that the true justice for meredith kercher site to be extremely in depth and convincing, as well as the murder of meredith kercher site.
Some of the highlights I'd say
The knife with MK and AKs DNA on it, this has been disputed, but it seems pretty legit to me.
The bra clasp with RSs DNA
MKs blood in the bathroom, some which was mixed with AKs DNA
The obviously staged break in (nothing stolen, clothes thrown about with glass on top, if a break in did occur RG chose the hardest way possible to break in)
conflicting and changing alibis for both AK and RS
bloody footprint on a bathmat in the bathroom, footprint too small for RG but just right for RS
luminal showing cleaned up and likely bloody footprints in the hall that would be a match in size for AK
AK seen by a shopkeeper that morning going to the cleaning aisle. Plus the clothes he said she was wearing just so happened to match the clothes laying on AKs bed
the phone calls... just read up on that cluster
AK and RS snuggling and laughing at the police station right after finding out her roommate was murdered... not to mention the splits and cartwheels
Seriously i could go on and on... There is a ton more.