In fairness to him Colombias approach was dreadful. And England allowed themselves to be dragged to that level.
No excuse for missing Stones kicking Falcao in the head or not sending off the defender that headbutted Henderson though.
If the ref now supposed to have omniscient God-like powers? Look at the video of the Barrios/Henderson incident -- Geiger's attention was directed at the two Colombian defenders bitching at him as the wall was being formed, and he clearly was not able to see the headbutt (I can't link to the youtube video here, because of lack of posting privileges, but look up "Why Barrios not Red Card".
The decision to give only a yellow card ultimately was due to the VAR official advising him as such. And it's Clear As Mud whether the referee is even allowed to review and countermand the VAR official in cases like this. There is a sideline TV available for the ref to look at, but I can't find anything online outlining the rules which state under what specific circumstances the ref is allowed to review the footage himself.
I actually think, when it came to major decisions, Geiger actually had a good game. Where he failed -- and others pointed this out -- is allowing the Colombians to bully him, especially when they surrounded him and scuffed the penalty area. He should have issued two or more yellows right there.