Uh, the point here is that Gore needs to examine his own behavior. He is setting himself up a moral standard bearer yet he is a huge consumer of energy. He needs to clean up his own act or else he has no legitimacy.
The church does not lose legitimacy because of a bad priest (unles it condones bad behavior). However, the priest loses legitimacy.
The green movement does not lose legitimacy because Gore consumes pigish amount of enegry. Gore himself loses legitimacy.