Maybe stockhausen's never been on a bus in London?
This attack caught the news attention because it trended on twitter and because of the LGBT angle during the pride month but similiar attacks, for a wide range of reasons, are not that uncommon on public transport.
In Camden alone (where the ladies are reported to have been attacked)
there was 136 reports of violence against the person between April and December of 2018 and 18 reports of sexual assault
I don't particularly think we need every politician and their dog to come out and 'express there disgust' at this one particular incident.
Unfortunately we live in an age where posting a twiiter comment or changing your picture to a flag on your Facebook profile is seen as doing something meaningful about a problem.
I'm aware of the potential irony of posting on a public forum here but at leat sometimes various issues are discussed and debated here and I don't think many people think they are changing the world by posting here.