I haven't read the article, but I believe it's probably a translation of an article that appeared in die Welt a few days ago that I did read. Sorry to disappoint, the Daily Mail didn't commission it!
It mainly centred around knife violence. Germany unfortunately like the UK has a problem with knife crime and it has gotten significantly worse since 2015. There is a particular violent subculture amongst some young men of a migration background and it's worrying. There are reports almost daily of knife attacks somewhere in the country. It probably isn't on the scale of what we see in the UK, but the change appears to have been rapid and now youth workers are saying that they don't have sufficient resources to try and deal with the problem.
That's the facts. You can look it up.
Now many are wondering what has gone wrong. It may be that the integration has failed, it may be that too many people were accepted in the country too quickly.
For what it's worth, these conversations don't function well in Germany either and the problem is never addressed because there are too many people on each side insulting each other and nothing is ever resolved.