Yeah I agree with most of your points. Australia never had the gun culture the US had (even before the Gun buy back). Most people in urban areas did not own guns, it was (and remains) mostly farmers.
I don't have a citation, but I remember reading a justification for suicide prevention fences on bridges, that found that it didn't just stop suicides from that bridge, it did so without raising suicides in any other way (i.e it lowered the total suicides).
I've always found it difficult to think of a solution to America's "Gun Problem"... It is codified in their laws, and from that is deeply engrained in their culture. Any reform has to first start reforming the culture, in my mind.
On the other hand, violence is generally decreasing in the US, so it's quite possible non-coercive approaches could substantially affect the spree-shooting problem.
Deeper structural changes would be needed to fix the actual gun violence problem in US which is completely different from the spree shooting problem (they're two separate problems, effectively): the violent crimes committed by illegally kept pistols (straw purchased, stolen, inherited, bought off the books) and is usually closely related to the drug war. It is also a deep inequality issue: the poor and minorities are far more likely to be affected than suburban whites.
I don't have a citation, but I remember reading a justification for suicide prevention fences on bridges, that found that it didn't just stop suicides from that bridge, it did so without raising suicides in any other way (i.e it lowered the total suicides).
I've always found it difficult to think of a solution to America's "Gun Problem"... It is codified in their laws, and from that is deeply engrained in their culture. Any reform has to first start reforming the culture, in my mind.