OP, you have no idea whether or not religion was a factor in this crime. Zero. Zip. Nada.
Although the OP is paranoid and is disdainful towards muslims, blacks etc., you are incorrect in your statement.
Yes, this particular case doesn't seem like there was any explicit religious tension and that's what the OP was trying to insinuate. However, you have to ask whether the propensity for violence and aggression is indicative of a particular group of people who belong to a particular religion.
Abrahamics are inherently violent; they have descended from barbarians and have committed genocide against many cultures in history. The christians destroyed the native Americans in America in one of the greatest pogroms in history. They destroyed all of Europe and committed genocide against the pre-christian Europeans. They committed genocide against many Asian cultures and tried to destroy India (and failed miserably).
The muslims are the same way; wherever they went, they destroyed, attacked, murdered, and looted. Look at Iran. Look at Indonesia. That is their MO. Look at the Israelis; they fight back tooth for tooth and that is the only reason they are still surviving today. The Abrahamic mindset is violent and its culture condones acts of barbarity with their 'my way or the highway' attitude.
Ergo, avoid Abrahamics like the plague. No wonder we call them untouchables.
XD