There aren't enough terrorists in the world that could kill as many Americans as Americans do themselves.
America is overdue for it's next mass shooting. A white guy slaughters a whole church of people? Or another 60 year old white American kills 58 and injures 500? We already have a nonstop supply of homegrown terrorists who have access to a military aresenal.
What military arsenal do "they" have access too? Me thinks you are just blindly spouting libtard talking points. So identify the arsenal please, if you can.