Mr Idris Bahray is not a victim of terrorism. He is dead nonetheless. Mr Idris Bahray was apparently killed by his roommate.
When you read the article in Der Spiegel, you will read that he died in an area where swastikas are painted, with an unresponsive police according to the Wikipedia articles. It is a grim atmosphere were "us and them" thinking prevails.
Such an atmosphere exists not only in Germany, it can be found in so many places including the Netherlands where I live. People are afraid. They are afraid on both sides. It is what terrorism does and intends to do. As a result people are looked at and treated as if they are the enemy. It is done by "us and them" and both sided feel justified in their fear and anger.
Mr Idris Bahray died in Germany, he was not murdered by a terrorist. As we are all terrorised, Mr Idis Bahray's death got the attention it did get.