Knowing why this foreigner SAYS he used guns to shoot up the place, I am reminded of a fictional character quote from an iconic movie.
“The circuits that cannot be cut are cut automatically in response to a terrorist incident. You asked for miracles, Theo, I give you the F.B.I.”
It’s like the foreigner invades your country and shoots your citizens, but gets stopped by a guy with a gun, so your response is to make your citizens turn in their weapons, to make it easier next time.
Disarm the pioneers as they set out on the Oregon Trail. Same mentality.