"Let's hear ideas about what's REALLY behind school shootings?"

I like to think outside the Klein bottle, looking at larger causative factors, instead of narrowly focusing on inanimate objects that receive most of the attention.

I think that the main factor is social dislocation. Human society has rapidly become more complex and conflictual, and the development of the human central nervous system has not kept up with the rapid pace of this change.

More and more teens have no faith in the roles that society has to offer them.

Take a look at Aztec, Inca, Mayan empires, as well as ancient Egyptian, Greek, Roman, Spanish, French and British empires. There were almost no school shootings/stabbings then. Instead, these societies just simply suddenly collapsed.

School shootings are not just another idiosyncratic problem in the middle of an oh so nicely engineered society. Rather, school shootings are an indicator of the level of intrinsic dislocation and conflict in the society. The inanimate physical hand tools are not the causative agents of conflict.

"Why I carry a Glock 29"

Several reasons.

1. Because it is chambered in 10mm. Why do I carry 10mm? Because 40 S&W is a tad underpowered for my tastes, and because 460 Rowland guns are just a wee tad too long to easily tote. 10mm is the answer to the following question: If 45acp loaded to optimum pressure levels is too much for a standard sidearm, then what size cartridge, when loaded to optimum pressure levels, is most efficient in a standard sidearm?
Well, if the 45 acp cartridge is reduced in diameter to .4295 inches and the length is kept the same, and loaded to 40,000 units of pressure, this may be too much for a standard sidearm. If the 45 acp cartridge is reduced to .375 inches in diameter and the length is kept the same, and then loaded to 40,000 units of pressure, there may be room for improvement  by making the diameter larger. So, someone, inspired by God, came up with 10mm as the correct diameter for a cartridge that is the same length as the 45 acp, and when loaded to 40,000 units of pressure, is optimally balanced for a standard sidearm.

There are only three classifications of handgun cartridges: Those that are unnecessarily too big, those that are unnecessarily too small, and the optimal balance point between the two: 10mm, full house load. Magazine capacity, bulk and mass of the platform, terminal effectiveness: All properly optimally balanced.

2. Because it is a Glock that is very reliable, and has magazine capacity of ten or fifteen rounds.

3. Because the Dan Wesson Razorback is too pretty to lug around in the rough and tumble world. Mine reposes splendiferousley on my coffee table as what I think is the most beautiful 1911, while my G29 with 15 round magazine rides with me aiwb.