You can´t blame Mike, you simply don´t know how much of it he knew. Besides, as I already said, that persons could have easily found another job with her CV: report the company with actual evidence (use your phone) and leave them behind.
Obviously, this person had other problems that drove her to do what she did. As tragic as it is.
I think that this whole thing is being blown apart into huge scales of what it might have actually been... fact is, Blizzard sacked one of the co-founders.. basically.