This argument, by itself, will imply that no-one in this world
can be criticised (who is perfect, you tell me?). So when someone
kills your pet dog, you cannot even criticise him and say "you
bad!" ... for you yourself at least kill an ant in your lifetime.
Both of you are murderers, that is.
And the parent cannot teach (read: criticize + action) their
children, for they're guilty of the same mistakes when they're
young.
A related scenario:
Boss: "Dick, please comment and give a criticism of the business
proposal"
Dick: "Err .. dun want la .. I can't do a biz proposal as good as
this, so I better shut my mouth ..."
