Does the Patent Office have no obligation to check the patents it issues are valid?
I believe you are correct. They have become paper pushers and only check to see if is a patent already on file. Way back when, you had submit actual hardware for most patents, then it was "proof" and the proof was checked. Now it's "give us the money, we'll check our files and if not a copy of something already there... it's yours." Pretty damn sad state of affairs.