The death rate due to mass shootings in the US is much lower [1] than the death rate due to homicide, so I was trying (unclearly) to imply that since the latter is so low as to not be worth worrying about when deciding whether or not to work in the US, then the former must also not be worth worrying about.

[1] By one or two orders of magnitude, depending on whose definition of"mass shooting" you use [2]. Mother Jones maintains a list, and theirs says that there have been 4 mass shootings so far this year, with 37 deaths. The Mass Shooting Tracker says 353 so far, with 462 killed.

[2] http://www.latimes.com/nation/la-na-san-bernardino-mass-shoo...