Accepting one's responsibility and actually succeeding are two different things. Ange feeling that he couldn't make Dier work in his team, while being honest about it and NOT throwing him under the bus, is a very great example of how his is different (in the best of ways) to Conte.In the same way Ange improved Dier?
Come on, these are not children in a playschool, at some point it has to be recognised that they contributed to the problem, it wasn't all on Conte.
These players are not children, but they are human beings, and how they are treated will affect them psychologically. So when your coach complains about you constantly in public (much like a child, ironically) for months, of course it will have negative consequences.
Also, I don't think anyone feels most of the players couldn't have done better, but that's a discussion about their shortcomings, not Conte's.