> How big a massacre would it take before a gun control law would be carried by a majority in the US?
A majority already does but they don't really care, whereas the NRA has a relatively small numbers of highly motivated people to push against gun control bills (I believe John Oliver made that exact point recently).
The US have already got bigger massacres than the already mentioned Dunblane (18 deaths 15 injured, 1996), or Port Arthur (35 deaths 25 injured, 1996) which resulted in significant gun control increase in the UK[0] and Australia[1] respectively.
A majority already does but they don't really care, whereas the NRA has a relatively small numbers of highly motivated people to push against gun control bills (I believe John Oliver made that exact point recently).
The US have already got bigger massacres than the already mentioned Dunblane (18 deaths 15 injured, 1996), or Port Arthur (35 deaths 25 injured, 1996) which resulted in significant gun control increase in the UK[0] and Australia[1] respectively.
[0] https://en.wikipedia.org/wiki/Dunblane_school_massacre#Gun_c...
[1] https://en.wikipedia.org/wiki/Port_Arthur_massacre_(Australi...