They just went shopping.
Tell me, what is wrong with that?
May they rest in peace.
n.b. There are at least 150 gun manufacturers in the USA according to Wikipedia.
Every mass murder leads to more gun sales, as people driven by fear, arm themselves just in case they need to defend themselves when they decide to nip down to the shops.
n.n.b. I have taken this title from The Clash album, ‘London Calling”.