Shazamgrrrl's tattered arse aside, it's kind of a fence sitting non answer, isn't it?
I mean for the Hal fans, they can say he's exonerated and didn't do it blahblahblah.
For the people who liked ET and it's events, they can say "Well, actually, yes he still did do it and still bears that burden of guilt and responsibility."
But the yellow alien fear eating bug thing? I dunno. I always preferred the "Unified Green Theory" that I think it was Mark Evanier put forth in a CBG column a while back. Basically the notion was that anyone that was exposed to the green power for too long ended up going power mad at some point. It fit too, because there was such a nice little history of GLs going wonky. (The Manhunters, Sinestro, Malvolio, Yalan Gur, Hal, I know there's more, but I can't recall now.)
But I do think Kyle's being written very well in this . I'm hoping there's more to it than this.