Isn't this a crime that someone is liable for? What happened is that someone hacked into a computer system without permission. Maybe it wasn't intentional -- sure -- and that would be a factor at sentencing. But it sounds like they've admitted to a crime, and obviously our legal system considers the humans involved to be the liable parties; otherwise everyone would just say "my computer did the hacking" and wouldn't get in any trouble.
I don't expect any prosecution here, but is the above legally accurate?