How many games has he cost us compared with the outfield players though? I would guess that its a lot less. I think he deserves a lot more support. Dembele went through two or three seasons of inconsistentancy before he hit consistent good form.I would disagree with that. The whole team has only let in 20 goals this year. He has also been the main culprit for some of those goals as well.
All keepers make mistakes but what is most worrying is that he seems quite hesitant when coming out (always a big strength of his) and his distribution really does put our players under pressure at times.