I agree with you 1000000% on your first paragraph. That's why I can't fathom out why you won't give VAR a chance. It's surely got to be better than the old system, it can't be any worse No? As you've pointed out about the old one, it's screwed us over for years. So why not give VAR a chance to see if it's an improvement. Doesn't make any sense to me.
You may well have some valid points on the concerns with it, but as per previous replys, united had one disallowed for a knee cap being offside recently, where they could easily have been favoured and were not. we had 2 against Arsenal, which if they were set to shaft us they could easily have done, but didn't. It's much harder under VAR to get some of the scandalous decisions that the old system gave us. Which you so rightly pointed out.
I've given you three actual examples above where VAR was used and it gave the correct decisions, where it could have been abused but wasn't. If you do the same with actual examples where it's abused us/favoured the rags then it's a discussion worth having. What ifs and maybes however are not. That's just hyperbole.
It will never be perfect but it will level the playing field considerably over the existing fiasco.... that's why the FA have introduced it in such a shite fashion as they want public opinion against it. VAR will level the playing field for the Rags (yet another goal wrongly disallowed against them last weekend, no VAR in operation). I just can't work out why any blue wouldn't want to give it a fair crack of the whip, as it will only ever benefit us compared to the existing state of play in the long run