Patents being invalidated doesn't mean the work done was invalid. A public disclosure, for example, that there was no practical way for an examiner to be aware

Patents being invalidated doesn't mean the work done was invalid. A public disclosure, for example, that there was no practical way for an examiner to be aware of, could invalidate a patent. Unless omniscience is part of the job requirements you're going to be sorely disappointed. Examiners don't make applications, applicants do. Very expensive lawyers do their best to get those patent applications granted. Sometimes the lawyers/applicant know that the final product is invalid but seek it anyway .. so someone harmed can seek restitution from the courts. The PTO try to stop mess, they don't screw up applications, they tear down applications; they unfortunately can't practically be 100% effective in that. I'm sure they could do better, buy you appear to require them to be perfect? Again, these comments are my own. I work in IP, but not in USA and not with USPTO.