Haaretz's target audience are international anti-Semites. Had the murderer been Arab, not only Haaretz would not mention his ethnicity, but it would also not mention his name, saying instead the murderer was Israeli (if he was an Israeli Arab) to leave an impression he was a Jew. If you were coming here often enough, you would have seen many such cases.
Lebanese protesters storm environment ministry amid trash crisis (AP)
from the article: Thousands attend funeral of slain kabbalah rabbi