The only time I've ever done it is when I've had a game crash and lost a previous result that I've already earned. So I just replay until I achieve the same or similar result, and carry on playing normally. Touchwood I've not had to do this for years.
I've never re-played a game because I felt injustice though. Sure, I've felt injustice many many times, but not to the point I need to restart. I lost the last game of the season, costing me promotion in my Aylesbury Utd game. Sure, it hurt, but that's Football. Plus I don't feel like I'd have earned it if I just played the match over and over until I got a result to assure promotion.
Not saying it's wrong. Play the game how you want to play.....it's just not for me.