Didn't every other country implement some sort of gun ban / buy-back after a mass shooting except for the US?Not every country but it's a common theme. Australia in 1996 with the NFA, the UK in 1997 with the FAA, Belgium in 2006, New Zealand in 2019... Not all had a buy-back too but countries do tend to make serious changes to their gun laws after these kinds of massacres.
As sad as it is, those people probably are going to get what they want. Two dozen preteens were massacred at school in Sandy Hook and the only real consequence was that the sales of the rifle used by the murderer skyrocketed. Not a single federal law or large-scale gun policy initiative followed. In 2012, the American people decided that the slaughter of those children and others was bearable and little more than an unfortunate inconvenience not worth doing literally anything over. In the eyes of many, that realization marked the end of the gun control debate. There can be a hundred more mass shootings and a million more dead by firearms, and it probably won't make the slighest difference. Facts lost.