So it only matters because we scored? Hmmmm. And its not hypothetical. Have a look for yourself. The ball was placed in the wrong position. Thats factual. The wall wasnt 10 yeards back. Thats factual. How is any of that hypothetical.
And no, the system isnt perfect, and refs can get it wrong, i havent said refs dont make mistakes. If a player handballs like Maradona did to score a goal for example, its a black and white decision. If the ref gets that wrong he has made a gross error. Problem is with some decisions, its down to an interpetation or the opinion of a ref. Thats why this decision that went against you has plenty of people saying it was right, and plenty saying it was wrong. I dont know how old you are, but like irishtony1878 said in his post, it probably depends on the era of football you grew up watching. For me, i'm used to seeing tackles like that as ok. Its not the case so much anymore. On this occasion, one person can think its a bad decision, and another can think its fine and depending on your point of view neither are actually wrong.
I'm sure if the previous poster is right and he was sent of for denying an obvious goal scoring opportunity, the red should get overturned.