Exactly. The problem ARE the people that cannot distinguish between fiction and reality ... but THEY are the problem and not the game. Normal adult people are absolutely capable of seeing the difference - those who don't have a psychological problem that probably will get problematic with and without such games.
I also read ALL comments here in this thread (I was curious if I would find some arguments that would give me actual insight on the question why anybody could be afraid of a game people play in their rooms) and though there were some insults coming from BOTH sides I could not find anything that I would consider to be proof that free speech needs limits. Call to violence, doxing and things like that ... because these are really dangerous.