Here in Australia, Gun Control laws have existed for quite a while. As far as I know, before 1996, laws allowed citizens with a permit to possess a semi-automatic weapon. However, thanks to our Government "buy-back" scheme and tougher laws around possessing guns, the number of them and the ability to access them as become extremely difficult to most citizens.
As such,
Australia has remained quite peaceful when it comes to mass shootings, but I won't deny
things still happen
Now I'm not saying that America needs to adopt similar laws in Australia - since that's likely going to cause a lot of problems for people about their personal security and that America might have kept the matter going for too long to start taking such action now.
But what I can say is with >355 mass shootings in 2015 alone - if gun control laws aren't going to do something about it - then what will? What are the causes of these shootings and why isn't more being done to prevent them?
To be fair, I don't have much knowlege on weapons statistics in America since Australia doesn't normally follow the U.S. and their problems. Of the 355 mass shootings, probably 10 have been reported on in
most* televised News programs in this country - probably because, as Mudbill said, since it doesn't faze us anymore. It's no longer "news" that a mass shooting occurs, but "news" when there is something unique about it (terrorism, hostages, racially-provoked, death of multiple law enforcers, length of siege, number of casualties, age of offenders, age of the dead).