Fifa don't see diving or general referee manipulation as a problem - that's fairly clear.
And when I think about the most memorable moments from the sport I think immediately of diving, cheating and the outrage over these perceived injustices. Would football be a more or less popular (and lucrative) sport nowadays if Maradona's hand of god hadn't happened? Or if Klinnsman hadn't taken every opportunity to roll around on the floor to the outrage of thousands of opposition fans? IMO these are things that stick in the memory, inspire passion and help to make this game the most popular in the world. We're living in dreamland if we think fairness and rightness are of paramount importance to an organistaion like Fifa.
Also, as these sorts of refereeing decisions invariably favour the stronger, better known and richer countries (or clubs), who in turn control Fifa, there is very little incentive to push for a fairer and more even-handed apporach to officiating.