In a 2017 video posted to Facebook, Greene expressed doubt that the perpetrator of the 2017 Las Vegas shooting, a large-scale incident she believes was intended as an attack on the right to bear arms, acted alone. She claimed that the August 2017 Charlottesville white nationalist rally, in which a counter-protester was killed in a car attack, was an "inside job". She said the 2019 Christchurch mosque shootings in New Zealand were a false flag for the same end.