Snailman what would make you think he did no wrong?
I think it's not that improbable he actually didn't.
By that i mean
wrong in a strict legal sense.
All those that had been arrested now had been for corruption, money laundering and so on. And not for being power-hungry megalomaniacs.
There is no indication (so far) that Mr Blatter has ever taken any amount of money for himself taken part in any actually illicit activities. I'm absolutely convinced he was aware of a high level of corruption in the ranks of the FIFA, but he may very well have been smart enough to make it impossible to prove this general awareness.
For him it was probably all about his personal power and the power of FIFA itself. Like a good old Machiavellian Princeps, he made very good use of all the weaknesses of everyone around & under him.
Underlings getting rich? Fine, as long as they function in my interests. I exploit their weakness. And if they suddenly refuse to play my way, I may be able to blackmail them very subtly by my knowledge about their dirty little secrets...