The story doesn't start with a guard murdering an innocent by-standing Arab. It starts with riots, with fire bombs on homes, with torched cars - then the death - then the riots again.
Security guard kills Palestinian in Silwan; riots ensue
Jewish security guard shoots 32-year-old man dead after being pelted with stones in east Jerusalem neighborhood; another Palestinian seriously injured in incident; police say officers, passersby injured from stones hurled during funeral procession
Every death is unfortunate - from what I'm reading, the first death was a result of an attack on the shooter, while what followed was an explosion of hate. There are reports of stabbing of by-standers.