They never fail to disappoint, the ramblings of idiots.
The Luiz decision was 100% correct and nothing to do with VAR. The rules are clear that if a defending player prevents a clear goalscoring opportunity and makes no attempt to play the ball then it is a penalty and a red card. The onus is
entirely on Luiz to avoid contact when he runs behind the attacker, there is no space in the rules to allow for "accidents". He prevented a goalscoring opportunity and he made no attempt to play the ball, it's a red card and the referee has no choice in the matter.
So the issue is the rule. Do we want clear cut rules, as it is now, where it's just determining contact and we should see uniformity with the punishment? Or do we want them written more subjectively, and sacrifice uniformity of decisions so referees can use leniency in situations like Luiz?
Where VAR failed yesterday was in the Manchester United game, and that was entirely about an incompetent referee who is determined to make everything about him.