If this problem was really caused by availability of guns, we would have seen the same thing happening even more often back in the days when anyone could purchase a gun without a background check and even buy them through Sears & Roebuck, and Montgomery Wards catalogs. This was as recent as the 1950's.
No, guns aren't the problem. Here is the problem:
"The truth is the lack of personal accountability. God has been driven from society. Political correctness, not rationality, rules us. It's now all about ME. The liberal agenda of the last 30-50 years is what is truly responsible for these events. For the most part, we no longer have decent, moral, respectful children in our society. We now have "give it to me now", "morals are relative", narcissistic little consumers for children.(Excluding of course maybe 25% of the country who still raise their children the right way). Therefore, these "I'm unhappy so somebody else must be at fault, "everyone's going to pay" events will continue to happen.
Then you throw in the added bonus of the mass media making you famous.
The current system can't stand illumination, scrutiny and a results based review. So what happens, these same maggots and parasites have to have something evil to spin the blame on and that, folks, is where their rabid support of gun control truly comes from."