I guess, when I have three people with knives coming to kill me, I'd better throw away my handgun to increase my chances of survival.
How many times have you had 3 guys with knives coming to kill you? Why would they want to kill you?
It does not matter. It's an example.
There are people in this world who are willing to hurt you.
They're called criminals.
Yes but you make it sound so likely to happen. I am pretty old and nobody has ever tried to kill me, nor do I know anyone who has been murdered. Our homicide rate is about 4.7 per 100,000 people. I don't think in my entire life have I met 100,000 people. While our homicide rate is bad compared to many countries, you are still not very likely to be murdered by criminals.
The only people that have ever pulled guns on me were cops. I came within a hair of being blown away for the crime of walking home from work. And if I'd been carrying myself, since they pulled the heat without identifying themselves, I might have taken a cop with me on the way out.
For what? Absolutely nothing.
That's what this mentality leads to.