I'm not putting any blame on Bob here (I've always been a dawn guy, not a night owl), but the city I'm in (not CA anymore) has lots of its bad things happening at 2am (the time of his stabbing) too.

When I was working in SF (downtown, SoMa, FiDi) I had a schedule that got me to a gym at 5am, the office at 7am, and back on Bart before 4pm. I can't remember the last time I was in SF after dark. Walking the city at 5-7am is like wandering the aftermath of a war zone. It's sleepy, but the overnight destruction and misfortune was on display.

That said, all the talk of crime here feels slightly premature -- the linked story doesn't clarify whether he was the victim of a random attack or by someone known to him.