That bridge has just gotten a lot of press coverage in the last few years and every article tells visitors exactly where to go to take pictures of the freaks and weirdos. Then they can go home and prove to their friends just how edgy their vacation was.
Same thing used to happen to me and the hardcore punk & goth crowds I used to run around with in L.A. (in the 80s). At least we had the smarts to charge the gawkers money per photo. $10 for a group shot.
Sangetsu - Thanks for the story and photos. Other than the tourists and radical nationalists it looks like it was a lovely day!