Maybe it could never be proven, or maybe there is evidence of Officials being encouraged to favour one side in certain games, there was evidence in Spain and Italy.
I still believe that for people that are professional full time football referees, to give the decisions that were given on Saturday, that all benefited one side, there is a concious effort. I can accept the handball goals as subjective decisions that I disagree with, I don't understand how 3...
This is not relevant to the quality of the decisions though, VAR may award a penalty or take it away, but we are only really pissed off if the decision is clearly wrong.