About 60 people have been killed in mass shotings in the US in the 48 days of this year.
> In America, mass shootings only seem to occur in "gun-free zones", where perpetrators know there is little chance of armed interdiction before they have accomplished their mission.
No. In America mass shootings are so common they're not widely reported. You're cherry picking mass-shootings to fit your narrative. If you look at all of them you'll see they occur all over, and not just in "gun free" zones. This is a consistant tactic used by gun rights advocates: exclude any gun violence they can to reduce the numbers. "This mass shooting doesn't count, it's gang violence", "These deaths don't count, they're suicide", "This isn't a mass shooting, because only 3 people died"
https://www.usatoday.com/story/news/2018/02/10/kentucky-murd...
http://www.telegraph.co.uk/news/2018/02/05/three-police-offi...
http://www.theadvocate.com/new_orleans/news/crime_police/art...
http://detroit.cbslocal.com/tag/mass-shooting-detroit/
http://www.palmbeachpost.com/news/breaking-news/breaking-pbs...
etc etc (This is an incomplete list of February's mass shootings.)