The fact of the matter is you will find more people willing to publicly bat for GOT than you will find people willing to bat for an "indie incest non-con game". And it's not like GOT has not received criticism for its content or that people haven't tried.
The movements here (the pro-censorship movement & the anti-sexuality movement) are mainly driven by religious beliefs, and as such, it comes as no surprise that they do not want to apply censorship in a fair or even logically consistent way; they merely want to ban things they personally do not like.
As I pointed out earlier, it's also valid that they are savvy enough to pick their battles and divide and conquer - you can't take down a critical mainstream success like GOT or GTA, but you can go after fringe games with content most people would be uncomfortable publicly defending.
