His attempt to make a save was almost non-existent. The ball travelled for about 4 to 5 seconds befor it got in, and in that time, his movements were chaotic and not at all coordinated. He didn't even know were he was in relation to the goal. In short, he was cought cold, unprepared and not ready to make a save. That's his goal imho, because of that. He should be thankful that it happened at a good time, when things can be fixed without many troubles. If he did that in a CL semifinal for example, the reactions would have been ten times worse, and rightfully so.
That being said, he was excellent except for that unfortunate moment. He is young and has a bright future, but he does make mistakes. And one of the ways he could fix those mistakes is to realise them first, not act like he did nothing wrong and blame those things on bad luck. It's no coincidence that he received two goals from 50m in a month.