Two statistics from the web:
Despite making up only 15 percent of America’s child population, black children accounted for 45 percent of the gun fatalities in 2009 and 2010...
59% of all homicides in 2001 in Los Angeles and
53% in Chicago were gang related, there was a total of 698 gang related homicides in those two cities combined whereas 130 other cities with population of at least 100,000 with gang problems reported having a total of 637 homicides between them
As usual, those on the left get gung ho every time there is a mass shooting of some kind and propose all sorts of "remedies."
And as usual, most of those remedies were either already in place, or would not have prevented the mass shooting. But, also as usual, enacting some feel-good "solutions" seems to be more important than figuring out what the real problem is and working to solve it. Feeling good is often easier than real-world solutions, but perhaps a part of the problem can be attributed to a general gun phobia on the part of leftists. Same as nuclear power--its the only thing that can really solve the energy problems we face, but because of their personal phobias, lefties just can't support nuclear power.
So the primary problem is not a few mass-killings by nut-cases, but in larger part is a Balkanism/tribalism that is developing in many inner cities for socio-economic and other related reasons.
But, in typical leftie fashion, their approach to the problem would be to require registration of all firearms and their owners, a "solution" affecting only honest and law-abiding citizens, but not affecting those who make up the majority of the actual problem! Way to go lefties!
So the bottom line--why push feel-good rules after each of these mass killings, rules which won't address the larger problem which centers more around gangs, drugs, inner-cities and their tribal cultures and the like, than it does random nut-cases and random one-of-a-kind homicides.
If you want to prevent these random mass shootings, there should be enough information out there to begin profiling those most likely to engage in them. Certainly the FBI has a good profiling department and presumably has some good ideas of the characteristics and traits to be watching for. Intervention with a troubled teen would be a far better solution than imposing loads of restrictions on law-abiding citizens. It also has the additional benefit that it might actually work!
Also, take suicides out of this discussion. Someone who is determined to commit suicide is a different situation entirely. They are not killed by guns, they kill themselves using guns. They'll use whatever they can get. If legal means are not available, and they generally aren't, and drugs are not available, then guns become more likely to be used. And so it goes, down to jumping off bridges and finding a length of rope. This is an entirely different problem with entirely different solutions.
/rant
(My member rating was getting too high anyway.)