Nowadays, you form your beliefs to fit your behavior, not the other way around.
You do not have to do everything disagreeable that you have a right to do
Only a person who considers himself too good for you is good enough.
Honesty is a virtue, but not the only one. If you're in a courtroom you need the whole truth and nothing but the truth; in the living room, sometimes you need anything but. Often.
Protocol is etiquette with a government expense account.
Society cannot exist without etiquette ... It never has, and until our own century, everybody knew that.