RE: Would we email each other about the danger of travel in the U.S. or even
a
specific state or city after someone was robbed in a dangerous area?  I
think we would not.

In fact we do just that, or have in the past when there has been a defined
threat in a defined place.  An example a couple of years ago was a serial
rapist that had hit more than once at an I-5 rest stop used by many
WetWesties members here in the NW.  But the info posted was specific, not a
generality about all rest stops along I-5 and was based on specific, current
incidents.  In the same vain we post to the list about stolen Vanagons, not
saying anything about crime rate in a certain area but in attempt to recover
stolen vehicles.  Specific and timely warnings about known conditions or
circumstances seem to be appropriate as opposed glittering generalities.