Stripping In Airport Is Freedom Of Speech?

From the Las Vegas Sun: An Oregon man who stripped nude at Portland's airport security to protest what he saw as invasive measures was found not guilty of indecent exposure.
Multnomah County Circuit Court Judge David Rees ruled Wednesday that Brennan's act was one of protest and therefore, protected speech.
Multnomah County Deputy District Attorney Joel Petersen argued that Brennan's strip-down was an act of indecent exposure.
"I was aware of the irony of removing my clothes to protect my privacy," Brennan said from the witness stand on Wednesday.
On April 17, Brennan arrived at the airport intending to take a business trip to San Jose, Calif. He works with groups in Silicon Valley and flies out of Portland International Airport about once a month.
When he reached the gate, he declined to go through the airport's body scanners, instead choosing the alternative metal detector and body pat-down. After the pat-down, Transportation Security Administration officer Steven Van Gordon detected nitrates on the gloves he used to check Brennan.
"For me, time slowed down," Brennan said. "I thought about nitrates and I thought about the Oklahoma City bombing."
Brennan said before his trial that after months of angst every time he went through security, the nitrate detection was the final straw for him, a wordless accusation that he was a terrorist.
So he took off all his clothes. http://www.lasvegassun.com/news/2012/jul/18/us-airport-security-stripper/
I understand the guys frustration, but to strip in front of kids and other people is uncalled for and it is not freedom of speech.  The judge couldn't care less about the people who had to witness this guy's "speech"- what about their rights?