He is an exception you know about because of all the news stories. If that wasn't the case, he would have not been more than a single blurb on the news and forgotten by morning. And he would be most likely in jail. A result you wouldn't have heard about either.
News outlets have a vested interest in shouting up the outliers while mostly ignoring the mundane. And cops are just the group you have outsourced the killing to so you don't have to.
I do not keep a gun on me at all times. Merely when hunting. I do have a first layer warning system called dogs. Hopefully the barking is all it takes to drive away a bad situation. But I WILL be awake before you can get out of your car.
And it's not about being afraid of my surroundings. It's about understanding that public safety, (police, fire, ems, and even neighbors), is a long ways away and I cannot expect timely help from anyone. If I have a heart attack at home, I will die for sure because EMS will never get there in time. So I need to be at least somewhat prepared for situations you don't even consider living in a city. Where help is a mere phone call and a few minutes away. Hell, I don't even have cell service in my yard to even call or text with.
So yes, you are at least somewhat correct. You can't imagine.