I will ask again was he, or has it been proven he was feeling someone up, or that he just touched hips in a crowded area, doesn't matter where you are in the world the context of the action determins if it is right or wrong.
For example on a matchday on the metrolink, or on the tube you are jammed in and cannot help but physically touch other people, in that context it's nothing wrong if it is unitentional and unavoidable, where as some dirty old fucker rubbing up against young women as has happened on trams before is wrong and disgusting.