Chris (Man in Japan) posted a hilarious “panel” discussion of why the Japanese do the V-sign in photos. You just have to read it!
Here’s “Noam Chomsky”‘s take:
The two fingers raised are a product of the brainwashed society created by the elites. The person being photographed has been trained by the media to see this small gesture as a sign of rebellion against what is permitted, thereby reducing the risk of greater action against the establishment.