The whole point is this: if you take the product Rockstar (or any other game company) sells you and you go in and modify it in any way, that company can no longer be held legally responsible. They aren't responsible for modifications from outside parties.
It's the same thing as if you...
I have been arguing this in way too many forums lately and I don't have time to make a lengthy post here at this time. So instead, I will quote the people from these many forums to try and explain to people how things in the game developing industry work.
First, a solid defense of Rockstar from...