That makes about as much sense as blaming POTUS when a democratic senator in the US takes bribes or kills his wife.
I mean, do you seriously think that when people take bribes, they proudly tell it around?
"Hey Sepp, old sucker! I just accepted millions of dollars in bribes for casting my vote to country XY!"
"Hey Jack! Haha, great work, high five!"
Sorry, I consider that ridiculous. At FIFA votings, about 200 people are entitled to vote. Sepp Blatter has no chance at surveiling 200 people 24/7, he's not the fucking NSA.
It makes perfect sense considering how close some of those charged are to him. He either willfully ignored the corruption, was in on it anyway, or was plain incompetent to not follow the obvious signs. These allegations have been put forward for a long time but rather than try and fix them he's willfully hidden things. Then we have the corruption report last year:
"Less than four hours later, it was all change when the Fifa report was criticised by the man who spent two years investigating claims of corruption on behalf of football's world governing body"
"The problem? Garcia now says the report is "materially incomplete" with "erroneous representations of the facts and conclusions"."
He had the information but hid it. That's also ignoring the fact he puts the policies in place to allow this rampant corruption or that the finger is now being pointed at him by his once colleagues and is the subject of investigation himself.