What indication do you have that it wasn't?
EDIT: I'm certainly not claiming he did anything, I read this as just sour grapes, but look for yourself at a sample - http://imgur.com/a/zv174
EDIT 2: This is more like it - https://www.bloomberg.com/politics/articles/2015-05-14/kim-d...
Look at this tweet from 10 hours ago: "My old hacker firm Data Protect hacked 100% of its clients." https://twitter.com/KimDotcom/status/815373371001028608
Another tweet from a few days ago claiming: "I know with 100% certainty that @Russia & @PutinRF_Eng had nothing to do with Clinton related election hacks!" https://twitter.com/KimDotcom/status/814593453963083776
It surely seems like Kim Dotcom wants people to think he is involved.
Thanks for those tweets, yes, he has done a lot of things that make him at least suspicious. I wouldn't take him seriously at all if not for the fact that he predicted some of this.
Incidentally, for those mentioning McAfee, I see no reason to take that guy seriously, nor am I presently aware of him displaying any foreknowledge of any of this.
But as long as we're wondering who might've leaked what, you have to admit that he's at least suspicious. He has had a longstanding grudge against them and I can totally imagine him hiring some hacker group.
I find it troubling that this avenue was not explored.