According to Emile Durkheim, the more fragmented, and individualistic a society is, the higher its propensity for suicide is.
https://en.wikipedia.org/wiki/Suicide_(Durkheim_book) (BTW for those of you who are too stupid to read, He's considered the actual expert on the subject by sociologists; you know; your "Science" gods)
Las Vegas is the height of Human Ego; New Babylon, if you will.
Ego is the deceptive element of the psyche that tells us were are separate from each other (and God)
I'm not surprised that there's a high suicide rate there, and this is also likely why Stephen King chose it as the congregational focal-point for the Ego-Enslaved followers of Randall Flagg in the Stand.