Yeah man not my cup of tea, but Let them live!! Rick.
Believe me, if I was in Japan I would stay well away from them
"... groups of bikes to prevent any possible incidents, which can include riding very slowly through suburbs at speeds of 5–10 mph, creating a loud disturbance and waving imperial Japanese flags, to start fights which can include weapons such as wooden swords, metal pipes, baseball bats and Molotov cocktails."
I always get the impression that the Japanese are mocking people when they do these mods.