"Of course Barr's letter tells us all we need to know," said people who were engaged in motivated reasoning. "If Barr were misleading us, don't you think Mueller would object?"
Then those same people dismissed reports that members of Mueller's team objected. Now they're rejecting reports that Mueller himself objected. And they're doing this even though the report's release makes it abundantly clear that Barr did mislead us. So they're making the same stupid arguments in support of the same stupid point even after it's been established that the stupid point is wrong. It'd be amusing if it weren't appalling.
A dishonest partisan fixer like Barr could fool people because they wanted to be fooled. And they still want to be fooled. This is how it works with Trump supporters. Even though the report is out, showing that Barr misled us, they still trust the dishonest fixer, because he tells them what they want to hear.
All lies and jest
Still a man hears what he wants to hear
And disregards the rest