reading this, social decline seems to be a general trend in western Europe if not beyond. Düsseldorf or Köln Hbf now have one of the hightest crime rates in Germany.
Hamburg Hbf was a dump in 1999-2000 when I was a regular. It remains the only place where I have witnessed open injection of hard drugs* in a public place. Indeed one recollection is of the whistle being blown for a train to depart and some junkie immediately rushing out from the toilet of that train onto the platform with a needle still hanging out of his arm.
That said, when I was a slack bladdered little kid I "might" sometimes have, er, watered the bushes behind the old shelter at Aughton Park once or twice while waiting for my school train, and there were often discarded needles there too. I never saw someone actually injecting there, though. And that's about as posh as it gets this side of Didsbury, St. Albans or Gerrards Cross.
What sadly does seem to be the case in much of Europe, sadly, is that illegal immigration from primarily parts of Africa has resulted in elevated crime levels from groups of lads hanging around who cannot work due to their immigration status so only have the option of crime. Europe really needs to get more of a handle on that (and it's many times worse than the similar problem in the UK involving "the boats") but it's not an easy problem to solve.
* Well, obviously I didn't ask them or test what it was, but I'm pretty sure it wasn't insulin, that being about the only thing that medical necessity means it is frequently injected in public as a matter of course.