So you admit the islamic attacks, of which there are a significant higher number, must also be xenophobic.
I do not admit anything. Maybe both cases are nutcases that are mentally ill. By the way: most victims of islamist terror are muslims.
Concerning your statement of a "significant higher number": what are your sources? I just checked the official statitics for Germany and in 2017 there was 1 (one!) offense with an Islamistic background (Knife attack in Hamburg) while there were 19.467 right wing offenses.
The rest of your post is an unhealthy vindication of the right-wing attack as some kind of self-defense. This is the train of thought of the Norwegian terrorist Anders Breivik.