But they might have a little trouble showing a jury that a piece of plastic killed a bunch of people. Jury selection might be key if it makes it that far. Could be this is just a group trying to get in on the emotional reaction on the shooting while it is still there.
Bingo.
Of course, they still have to show how it was the item, and not the criminal misuse by a human being, that caused the injuries and deaths. Going to be a tough sell to the jury, I'd think.
We don't sue the maker of a steering wheel cover - or even the car itself - when someone drives through a playground and runs over a bunch of kids. We blame the driver, as is proper.