second, I heard a story a few days ago, from one of my friends neighbors that this lady ( mid 70's ) heard and saw kids in her back yard trying to break an entry. The lady was the only one at home, but she grabbed her husbands shotgun. No ammo mind, and when she heard the glass break, she pumped it so it made the loud click-click. Those would-be thieves took off so fast they left most of their equipment behind.
Take a look at this link;
man-defends-self-against-4-armed-home-invaders
Now tell me: How many examples are out there, in which this strategy failed, for example the "defender" overestimating his chances? If you legally have a gun, any criminal can also legally have it. In Brazil, your defense theory results usually in even worse attacks: If you can't get the wealth as single attacker or unarmed, you form gangs and attack more aggressive. If you are lucky, you are more worth alive for the attackers, and just get kidnapped.
Eventually, the only protection of you will be forming bigger gangs of law-abiding citizens, who protect themselves. This is the concept behind citizen patrols and militia. If you have your gang specializing on fighting crime and finding convincing evidence for a judge, you have a police. Such concepts did not arrive suddenly because a god told a prophet to become the first policeman. They evolved over times and under the pressure of equally fast evolving crime.
As stupid, as total gun-control can be, total gun-freedom is. Freedom comes with responsibility.
Now tell me, should we ban guns so that only thieves and killers are the ones carrying them? --or can we let regular average people carry guns to defend themselves against such attacks.
Don't you think, that thieves and killers are also regular average people? At least, before they do their crimes? And how can you defend yourself? You and your gun can work against 4 kids, who just want to try it. But if you have a gang of 4 kids, who don't just want to try it, but expect you to be armed and possibly interfering, you can be lucky if you awake with the muzzle of a SMG in your face.
Also, forget the idea of "We need to be able to fight our government, if it becomes criminal." If the majority of the country fails to stop such developments with political weapons (from democracy, over law, over army, national guard and militias), you can only commit a honorable suicide that way.
Germany is a country with the strictest gun control laws in the world. It does not prevent such crimes. But what people found out and what they apply in the police tactics since Erfurt: The earlier you have policemen on the scene, risking their lives for protecting innocent, even without daily assault squad training, the earlier the killing will stop. This also applies to yesterday, though the strange behavior of the attacker fleeing when the police arrives shows some required improvements.