Czuch Chuckers: That Mastroeni's slide hit directly the calf of the Italian player. I remember that when I saw that tackle, I thought to myself "Ouch,I hope he didn't break his leg". It's was an extremely dangerous play and it doesn't matter that he got the ball as as well.

You cannot compare fouls for which a red card is given. There are simply situations for which a player is sent out. Compare an intentional hand ball on the goal line and and intentional kick in the head, for instance. That's just uncomparable. Yet both situations require red cards.