"The humane response to the tragedy visited upon Las Vegas is not legislation but consolation, for both victims and survivors."
If someone supports the ownership of these weapons, maintains their right to have them and use them then they are, in small apart, responsible for the deaths of all people killed in this manner; that is the situation you perpetuate and maintain. That is what collective responsibility is about, that is what upholding a constitutional amendment that is anachronistic and downright dangerous means.
If I were a person being offered such consolation, I'd tell the person crying their crocodile tears to act with an ounce of integrity and then I'd tell them to fuck off.
"the big difference is simply the number of firearms available."
The big difference is the culture of violence that the USA is mired in.
As I say above, these things happen because a large number of people think the right to own a gun (outside of sport or hunting) is more important than the lives of their fellow citizens and their lives is a price worth paying. That is the plain and honest truth if it. If it wasn't, then the guns would be in bins and that would be it.
Like olddude says, it's another nation.