I think the fundamental ideological conflict here is between those who believe in "better safe than sorry," and "better to risk one's life, rather than take an innocent life."
Both are valid viewpoints, in my humble opinion. However, I think a lot of it depends on who exactly you're protecting. If for example, I was the last line of defense between someone who's broken into my house and my wife/children, then I'd be much more inclined to lean towards the first option.
Example: Pulling a gun on this person and telling them to freeze, getting shot, and dying with the knowledge that your family is defenseless would suck.
However, not everyone has to worry about a family or such. And if you can see this break-in is just a twelve year old, I can easily see how someone would not shoot first.
I don't say this to prove one method of thinking superior to the other. I'm just trying to get people to see it from both sides.
It290, if you would risk your life for a stranger, you should be proud. That's very noble.
In closing, I'd like to throw in another quote I happen to like that concerns gun control: "Better to have a gun and not use it, than to need a gun and not have it." I know that doesn't really fit in with this discussion, but I thought it was a good quote.