tl;dr: A caretaker groped a student. She described walking up a staircase when she felt her trousers fall down, a hand touching her buttocks and grabbing her underwear. According to the judges, what happened “does not constitute a crime” because it lasted less than 10 seconds.
Thought experiment: If someone hit that guy for less then 10s, wouldn’t that be a crime, either? Or has the assault to be sexual for the 10s rule to apply? What if the guy was hit with a huge dildo then, would that render the 10s rule applicable? (Obviously an academic question, not encouraging anyone to hit anyone.)
I have an answer to this question, as well as to why all the fascists (except one) weren’t prosecuted after the war but left alone so that they are now ruling the country again. The reason is: they needed Italy to be a “liberal” western democracy, while giving too much power to the socialists/communists in the 50s/60s/70s would have made it too close to Soviet neighbours, endangering the equilibrium of the area.