Nowadays, there are security guards (men and women) who patrol the corridors and public restrooms. There is a sign posted (in Japanese) to notify people that there are security patrols and that 'inappropriate' or suspcious behavior should be reported to the station staff.
Nevertheless, the cruising goes on. I just find it totally amazing that this young (hot) guy was so into making sure he got himself videotaped. The older man who horns in to cop a feel is a pretty typical occurrence. It has happened to me, too.
Just last weekend, I went out to sunbathe along the embankments at Tama River (suburbs of Tokyo). I stripped down to get mostly naked -- I was wearing some mesh undies and was sitting casually, reading - but also rather unobtrusively. Along comes this old gizzer who proceeds to sit down and state at me from about 5 meters away. Eventually, he starts rubbing his crotch and gets up and moves down the embankment into some bushes and pulls out his shriveled old dick - as if to coax me into come down to gobble on it. (LOL). I just ignored him - not that I hate trolls - What the hell! I going to be one someday - but I hope I won't have to stoop to trying to lure a blowjob from someone 20-50 years younger. Even when the victim (me - in this case) is obviously uninterested and turns away. I guess it was just 'excitement' to the hungry hunter. Finally, after not even a glance from me for 5 minutes, I started to act as if I was packing up to go. Consequently, he got up and made his way slowly further down the river, constantly stopping the bicycle he was pushing and giving me long desirous glances. But to no avail.
A few minutes later I hightailed it out of there. Just to try cruising the toilets at Shinjuku station and later go to 24-Kaikan - a gay/men's bath.