Ok, so what's the best case scenario here for THQ, if we give them every benefit of the doubt?
Someone from 8 chan emailed them and said "Hey, we run an internet forum, would you like to do an AMA?"
Then the THQ PR man asks some questions and all the answers seem legit (but doesn't do any sort of independent research).
8 chan assures THQ that they'll moderate the forum and keep the trolls away, just like any other forum.
So THQ PR folks walk into an ambush, ignoring all warnings that they shouldn't be associating with that site when they announced it on Twitter.
They get to the website, don't think to look around and see the grotesque amount of hate filled content they'll be associating with.
Start the AMA and get shown a bunch of despicable images and questions.
Give all the wrong replies as they don't realise the kind of situation they're in. Then they panic and go into damage control mode.
That's a ridiculous amount of incompetence.