Always funny when a European corrects an American that the rest of the world is not America, as it is obviously Paris.
Very needed when like in Bataclan the authorities take a secure the parameter and wait approach, like for Columbine and the Pulse a gay nightclub in Orlando, Florida massacres. Or when the closest authorities cower in fear as in the Stoneman high school shooting (that was addressed by police units from further away).
Someone upthread made a good point: a regular person in their everyday life does not need a fire extinguisher. Most people go their whole lives without ever using one.
Several months ago I listened to a story about Myanmar on (I think) NPR's The World. After the coup and after the military started shooting protesters, many urban pro-democracy activists sensibly realized that nonviolent action wasn't going to work, and headed out of the city to get trained by some ethic rebel groups in the countryside.
However, when they were done with their training they had to do back home unarmed. Myanmar has strict gun control, and the rebels didn't have any guns to spare.
So, in summary: you don't need a gun until you do.
Edit: I think this is the story: https://www.pri.org/stories/2021-06-02/souring-peace-marches...
So maybe instead of the OPs thoughts only applying the one country, maybe your thoughts only apply to one continent: Europe?
Now with respect to the article, my sisters are very interested in gun ownership because in their own words “no one needs guns just to protect against robberies”. And I agree, for peace of mind when it comes to bodily safety it’s better to trust yourself instead of being forced to trust crime statistics and police response times.
To correct one fallacy, brandishing a gun is largely unnecessary. If you brandish, you might as well use. However, knowing that you are armed can give you the courage and confidence that puts off attackers. For the most part these guys are opportunistic, and only escalate when they are sure someone is defenseless.
I don't know if that can be proven. He never had a medical assessment that established that at the time, and everyone involved would have had incentive to say he was already dead to avoid initiating a confrontation with the armed attackers.
A world where a regular person in their everyday life do not need firearms exists all over the world. Are you the police? are you the military? and if so are you currently working? If not then you do not need a gun.
The police all over the world do show up when needed, and the don't shoot people unless it is a complete last resort. In the very rare case you are a person that is being attacked, they're even trained so well they don't shoot the person attacking you and can deal with it in better ways.
The only thing firearms help an average person do is compete in a shooting competition. Take a look at the rest of the developed world and realise that your thoughts on this only apply to one country.