The FIGC does do a good job in chasing down corruption, it's something of a national pastime anyway. As long as someone is getting fucked half of Italy is happy. Juve are just an easy target.
What they don't do is follow common sense or evidence. This is shown time and again in Italian law, so it's no surprise to see it filter down to something less serious like football.
Italy likes to 'air its dirty laundry', other associations like to keep the false facade. Whether that's for financial reasons or general self-preservation we don't know.