Former patent examiner here.

Getting angry at the examiner when the patent stinks is similar to getting angry at programmers when the application stinks. Often, it wasn't the programmer's fault. Management didn't give them enough time, for example, so the programmer did the best they could given the time constraints.

And that's exactly what happens at the USPTO. Many examiners understand that patent quality is a problem, but USPTO management simply doesn't give examiners enough time to do a quality job. Mistakes will happen.