[Zetack]

Even though you waive the white flag, I'll throw in, at 1-2 a year in the US, you would expect one in Nevada - not necessarily Vegas, but Nevada about once every 37 years or so.

Obviously that's not exactly right as you'd have to weigh for population density and other factors, but as very rough calculation, it gives you the idea that this just ain't very frequent...

--Zetack


Edit: Ok I just read the link, (which says it was updated 3 minutes ago) and they said it was a murder and the dead person was the intentional target. So it wasn't somebody just going off, it was your garden variety (except for the incredily unusual weapon) murder. And I would put those in the category of relatively frequent. I'm sure vegas doesn't go 37 years between murders.