Dude with Bush T-shirt stopped from boarding

What is the world coming to these days? What happened to the libertarians of old, those who cry out and risk their lives to safeguard the freedoms of others?
We are in great need of young, energetic people who fight for freedom of expression in an age that is becoming evermore controlling. An age where a guy wearing an item of clothing to express his views on the current occupant of the Oval Office is restricted from boarding an airplane.
It gets better folks - the airline stated the reason for this restriction as a measure against offending other passengers on the plane. Is their anyone in this planet, apart from his mother, who would feel offended by a mockery of Dubya? If their is, well, what on earth do they feel on those rare incidents in which he choses to make a fool of himself?