Did we stepped over the word "also"? I think conceding 4 right after subbing him off is an indication. Obvious your other 2 reasons have added as well to the result, especially the red card early in the game, making it an uphill battle. However there was still a penalty in the 43th minute that was missed. Surely a 2-1 scoreline would have had them fighting for a draw. If not, then they are a bunch of mental midgets. I have played a game myself where we were down 4-0 and beat the opponent with 5-4. Never give up. An unfair ref is nothing else than an obstacle to overcome. Should have been accepted with both hands as a stepping stone to grow as they are in a vital moment of their learning curve.