Think of it this way. Certifying authorities are the friendly patrol officers on the net. You are an email. You need to find an officer to escort you somewhere else. So you interrogate the officer you find. Is he a real officer? Does he have credentials? Do you recognize him? If the answer is yes, then you let him be your escort. If the answer is no, then you run to the police station and make a complaint. This is how Google’s certificate pinning is supposed to work.
It is obvious that none of you has the faintest notion of the bitter disappointment each of you has in your own way dished out to us. We are seeing the miserable death throes of the fourth of your collective marriages at the same time we see the advent of a fifth.