Maybe the photo subjects are Hawaiian and are trying to wish us well?
Some of you may recall the famous picture of the crew of the USS Pueblo, captured by the North Koreans in 1968, flipping the bird.
From here: http://www.rockymountainnews.com/drmn/local/article/0,1299,DRMN_15_1586160,00.html
And they figured out that their captors did not understand the meaning of the middle-finger gesture, which the men often gave to the guards while calling it a “Hawaiian good luck sign.”
That was well and good until a photograph of the middle-finger gesture made its way back to the United States and the guards learned they were being mocked.
That led to what the prisoners referred to as “hell week,” which included angry interrogations, beatings and forced “confessions.”
And from here: http://www.campdudley.org/flash/alumni/CDA%20Articles/Spring03/Pueblo%20Incident.htm
Over the next eleven months, led by Commander Bucher, the crew excelled at teh tasks we were assigned. In countless letters, photographs, and films the crew used phraseology that would translate well, but which contained double meanings. We also displayed consistently the “international finger of derision”. In our written word we paraphrased Navalese and American slang to make our point.
Our success at this work was rewarded in two very different ways. In late October Time magazine published a photograph of some of our crew members exhibiting the well-known index finger signal, which fact quickly made it back to GG’s desk. The result was Hell Week, which lasted into mid December, the worst set of beatings administered by the North Koreans. I ended up with a badly swollen right face, cracked ribs, and black eyes, all from being kicked and beaten with fists and boards. These beatings were unpredictable, and delivered with a rage not previously unfurled. For all their severity, they hurt the least, since every blow told us how successful our discrediting attempts had been.
Lesson – be careful whom you flip off.