If game gives you inferiority complex, than you've inferiority complex. We just want to see the girl get good dicking. So, it's all fun n game.
That is certainly a motive. But the "to see the girl get good dicking" thing also exists in other games that have nothing to do with NTR.
I think another important motivation to play NTR games is the fact of humiliation of the woman (Anna) and of course the man (David).
These two acts, the sex and the humiliation, have an irresistible fascination for the NTR fans.
From some of the comments here I conclude that for some on F95 the process of humiliation is even more important when it is combined with sex.
It's a fetish, you don't have to like it, it has nothing to do with "inferiority complex".