Smyslov Fan, I'm not sure what you're claiming here: is your general point that Magnus is the world #1 mainly because he is fortunate enough for his opponents to make mistakes (and apparently, only when they play him and not when they play other super GMs)?
If this sort of thing happened just one time or something yeah, I wouldn't make much out of it, but this is what Magnus does so often against his top level opponents! You'd even think Radjabov would be prepared for a long fight this time since he's been through this before! Considering how many equal endings Magnus has won, I have to question whether, even for 2700+ players, it's really so mindlessly easy to avoid being outplayed from some of these simple looking endings as it may seem.
Maybe inaccuracy is a better word. I think he sees more subtle inaccuracies than his peers, makes fewer of them himself, and is more consistent in his play. That combined with his amazing positional abilities (google for Kasparov and others talking about Carlsen's amazing positional sense) and incredible endgame skills is more than enough to explain why he is dominating the chess scene at the moment.
There is something to the idea of him having a psychological edge, but it's the same kind of psychological edge that Kasparov and Fischer had. People are scared because they know when he is on form, they're in for an incredibly tough game that they will probably consider themselves fortunate to draw.