VAR and the art of not changing anything

Another baffling refereeing inconsistency.

How are the two incidents involving Leicester’s Evans and City’s Laporte different? Both saw them wrestling the strikers down in central positions about 30 yards out. One got a yellow, the other saw red. I presume both were reviewed by the same VAR team.  I can only guess that it came down to the initial decision of the referees, which were not overturned. The likely reason- No clear and obvious error? If that is so then the rule is ridiculously vague and allows for bias.
Tired (of controversy) Gooner, London

I wrote the above after yet another mystifying afternoon in which there seem to be parallel or multiple universes operating in the world of professional football. If this is going to be the way things are, then they should chuck VAR out altogether.