Arguing that the US has an attachment to guns and violence that is ingrained since colonial times.

It might be true, but I am not sure we can tell for certain.

Nearly half of Republicans say that mass shootings are something that Americans just have to get used to — forget about trying to prevent them.

I think this means that understand that the way to prevent mass shootings is to take away their guns. And I think Democrats should start saying, "Defeat the Republicans and take away their guns!"