He's being ignorant about it and tries to blame others for the mess MtGox caused. On a speculative note, he'll propably walk out of this with millions in his pockets, while his customers lost tons of cash due to this mess.
I'm surprised nobody is posting detailed traces of all the Mt. Gox bitcoins. They can be traced through the system, right? It should be possible to figure out how many Mt Gox still had when it went down. It should be detectable when he transfers them to a different account or sells them.
Honestly, Mt. Gox users are not that bright (of course with exception).
Either that or their entire IRC channel is full of trolls because some of the statements being made there are completely insane.
It's almost like they've never done any research about what Bitcoin actually is and just ran to Mt Gox to buy up this magical currency that they were told would make them rich. Just to note; I'm not talking about the Doge trolls either.
I don't know much about Japanese law, but in the US, there are times when it's deemed necessary to "pierce the corporate veil". If he's got assets, I suspect people will go after them ... though it might take him 3 years to notice his personal accounts are empty.
The other possibility is that he's incompetent in his personal life too ... maybe his paychecks have all been spent? (I hear gaming cards are collectible!)
I think they are hating Mark for losing their money, clearly a 'mess up'.