Most of it was a planned sale program that he notified the SEC and the public of his intentions of executing well in advance. I'm not sure if the option exercise/sale portion was part of the planned sale, but he has a lot of lawyers, its unlikely this is a trivial thing to bring charges over.
If he was aware of the problems with CA and Facebook data breeches prior to the planned sale filing, we might have a case, but its not open and shut.
To the public who is not going to understand how the SEC regulates insider transactions, the timing LOOKS HORRIBLE and we can blast him over it.