Just because I'm dumb, how exactly is HG to blame? HG Policies state that if you are able to contact and verify from your primary email, they will give you the information you request.
So, Assuming that the email was hacked (which it was since the twitter was comp'd too), then the security problem falls on the comp'd email account. Which I will guess (purely guess) was based on an unsecure cpanel server. The logic that HG replying to a verfied owners email is like saying, its twitters fault that the forgot password button sent back the twitter password too.
Don't shift blame. It was a mistake, the email got comp'd, it caused the problems all the way down the food chain. It sucks, its causing horrible problems, lots of legal issues involved, but at the end of the day. the email got comp'd. Done and Done. In the future matt needs to not use his famous whmcs email for all his secure accounts.
I'm not mad at HG for releasing the data, at twitter for having a forgot password button, and i'm not mad at matt for the hack. Its a good learning lesson for all, so many people use easy emails for all their secure stuff, and a simple hack of email can give someone access to your life.