But we didn't and Rodrigo was injured so, irrespective of how referees actually interpret the laws of the game (and let's face it, you're absolutely correct that there is no consistency so that really doesn't mean anything when considering how they make decisions) how can you argue that Law 12 doesn't apply? If the correct interpretation of that law is that a red card should have been issued, maybe every other decision on a tackle like that (and I can't remember that many where it was so obvious that a player was so obviously taking an opponent out) was wrong and the law needs amending.
I actually think it's good to remind ourselves what the rule book says as that's what referees should be using, not their own interpretation of it (isn't it?) So at the risk of repeating myself,
"Any player who lunges at an opponent in challenging for the ball from the front, from the side or from behind using one or both legs, with excessive force or endangers the safety of an opponent is guilty of serious foul play."
For me that is precisely what happened - and whilst you and others can of course disagree doesn't that just epitomise what's wrong with the game today - lazy refereeing because if they don't apply the laws on field as written it doesn't matter cause VAR will sort it out? Sadly VAR is just as flawed as on the field refereeing because (shock, horror) it isn't the VAR equipment that's to blame it's the same piss poor referees making the same lazy mistakes with or without the video equipment to help them.
And that's indisputable as it has been proved so many times this year.