Well, the person murdered because they're black, gay or jewish was murdered specifically because of a fluke of birth or part of their genetic make-up. There's not exactly much they could've done about it.
A person murdered in a botched robbery or carjacking was just in the wrong place at the wrong time. The intention was robbery, not specifically murder.
I'd like to see you try to tell that to the wife or girlfriend or husband of the person who was just murdered "at the wrong place at the wrong time."