Inna lillahi wa inna ilayhi raji'un.
My thoughts are with the family. If this happened to my father I don't know what i'd do.
It's unprovoked **** like this that contributes to the failure of integration. Unfortunately, views like the ones the attackers held aren't uncommon at all. While certain minority cultures do stand in the way of integration, this stuff does the same thing.
I've lived in predominantly white neighbourhoods my entire life, I've primarily had white friends throughout education, I have "white" hobbies, I speak English at home. I'm probably as integrated as one can get, yet stuff like this always makes me wary. I still feel like an outsider at times, so I don't find it that surprising that other people have such a hard time integrating.