Want to stop mass shootings? Arm more people with firearms.
Let's say you live in a totalitarian state that has banned firearms from citizen use, such as England, and terrorists show up and start murdering people. What do you do? Run, hide, and then call the cops. Why? Because the cops have guns, and the only way to stop a bad guy on a murdering rampage is to shoot him dead. Sure, there are other weapons, but shooting them is usually the most effective solution.
Therefore, the principle that even leftists believe is that if a madman is on the loose, you need to call the guys with guns (the cops) to stop them.
In a busy city, it takes cops minutes to respond when seconds matter. In the attack I linked to above, it took armed police 8 minutes to show up. By that point, 8 people were dead and 48 were injured. And the terrorists didn't even have guns, they just had a van and some knives. 4 unarmed police officers were injured too, unable to effectively stop the attack, so it's pretty clear that being an unarmed cop in this kind of situation is pretty much pointless.
How many lives could have been saved if somehow the cops could have been there within 30 seconds? Is that possible? For the cops, no, unless by some coincidence they were already happened there. But you know who else was in the area? The victims being murdered. And if those victims were trained and had firearms, guess what? They could have stopped the terrorists, and maybe lived out the rest of their lives in peace.
Firearms are great equalizers. You don't need to be a trained martial artist with 20 years of experience to effectively wield a pistol. You don't need to be young, or in great shape. You can be a 50 year old lady who never exercises, and if you've had a few days of decent training, you can effectively deploy a pistol to protect yourself and those around you.
The bottom line is this: The only effective way of stopping a bad guy is a good guy with a gun. Everybody believes this. Regardless of your politics, left or right wing, authoritarian or anarchist, when a bad guy is trying to kill you and you're unarmed, you're going to call the cops for help, because the cops are the proverbial "good" guys with guns. So why not arm more people and have good guys with guns on every street corner, in every restaurant, in every church and mall?
Every time a mass shooting happens, the left calls for more gun control. Sometimes, even the right calls for more gun control. The government always seeks for a way to gain power, and disarming people is the surest way, because an unarmed person cannot protect their rights. The media is largely a corrupt spokesperson for the government, so they'll happily play along, especially since they get more clicks and ad revenue from sensationalizing tragedy.
But what about you? Don't you want to live? Don't you want to protect yourself, and your family? Maybe even your neighbors? Where's your sense of responsibility?
I know why the government doesn't want you armed, but why don't you?