What really needs to happen to move to a solution for the current situation is a clear definition of the issue. We have people with ton's of solutions, but without a clear definition of the problem they are meaningless.
Full disclosure, I am a gun owner, I am a sixth generation Texan, and I am not a member of the NRA. Don't agree with them on a lot of issues. I am fiscally conservation while socially more liberal. I say these things to clearly define myself to try and avoid some one accusing me of being something I am not.
I live about 18 miles from Santa Fe High school and know people in the community.
The guns used according to all reports were a 12 gauge pump shotgun, and a .38 revolver. For those unfamiliar with guns the shotgun required for it to be cycled after each shot (slide pulled back and new shell put into the chamber to fire) and the .38 is like what most would think of is like a six shooter from cowboy movies. Six shells in the gun and after each round is fired the cylinder turns to put the next round into firing position. No assault weapons, not even semi automatic weapons. While the .38 is a handgun and more regulated the shotgun is not nearly as regulated and most often used for bird hunting (duck, goose, dove) and you vary the shell by what you are shooting. Typically they hold two in the magazine and one in the chamber because federal game laws require that when hunting federally controlled migratory birds that a hunter have no more than three shots before reloading. A plug can be removed from the magazine to allow an additional two rounds be fired before reloading bringing the capacity to five rounds.
I mention all this because this incident does not fall into the line of the weapon being the reason for the number of deaths. It just shows that a bad person with bad intent can lead to devastating results regardless of the tools. So this forces us to ask how do we change things? Someone mentioned gun registration, laws banning the sale of weapons to people with criminal backgrounds, gun owners locking up their guns. Well believe it or not those laws exist but obviously don't work. Others say that we should be more restrictive on background checks, do more investigation of mental conditions, financial stability, is the person a domestic abuser, etc. Well that could work but this is also where those with a more liberal bend take exception. They would ask, as would those more conservative would ask as well, "how much of our freedom must we sacrifice for saftey?" Parkland students made their dislike of clear backpacks, and metal detectors very evident and claimed constitutional rights of privacy when asked to commit to these things in the name of saftey.
So the biggest issue to be answered as we head down the road to solving the problem is what amount of freedom do we forgo to avoid these incidents? I will note as others have that guns have been here all along and the laws were not as stringent as they are today when I attended high school all those years ago. We had kids with guns on a gun rack in their trucks in the parking lot of my high school and we did not see these incidents. Why? Society has changed kids are way to serious and do not value life the way prior generations did. Teen suicide rates are up, bullying is increasing, overall our youth are just to overwhelmed by life.
The answer if we ever get there is going to be on multiple levels, tighter background checks, mental health awareness, increased security at schools, more parental involvement, and a huge societal shift that says fixing these issues start at home. Without that acknowledgement we will never come up with the fix.