He's human, everyone makes mistakes, what makes or breaks you, especially as a keeper, is how you react to those mistakes.
There isn't anywhere to hide in goal, you're remembered for that one mistake as a keeper, and the other 89 minutes are forgotten. It's unforgiving.
A forward misses an open goal, and it's forgotten in a minute.
Goalkeepers are a different breed, they need to be. It's why it's so important for keepers to be able to put their mistakes out of their head and move on, deal with it after the game.
He'll be better for it. He's young, on a massive salary, starting for England and the champions of England, and the whole footballing world is singing his praises.
A bit of grounding, practicularly when you've no competition, isn't the worst thing to happen to him.
It cost England today, but he'll benefit from it in the long run.