Spur of the moment unprovoked attack. I'm not sure if you're married or have kids brother, but if you are/do, then they are your charges. Everyone looks to the man/leader of the home for protection should the need arise. Even in homes where the wife runs everything and she has control...(a lot of men have to ask their wives if they can do anything or to have some money)...That's ok I guess as far as that goes, if it keeps the peace in the marriage, you know? But the man should realize and be ready, because in moments of crisis, the woman may quickly hand control back to the man, and say, feed us, protect us, whatever. He has to be ready to rise to this and not let her down.
You may not be a trouble maker, you may be the most gentle person in town and just stay home and mind your own business...but trouble could come knocking on your door. (It did me!) Luckily I was ready. he was a big ol boy and I have a hurt back, so he could have had me for lunch, had the Lord not been with me, and that I was armed. These are the last days brother, and famine is probably coming too. Even normally peaceful people can turn violent and cross lines, when they or their family is hungry.
It doesn't mean that you would have to shoot them, even if something did happen. Most times the mere display of a weapon will end the confrontation. I was attacked by a big dog once too, and I didn't have to shoot him either. Just one warning shot into the grass to turn him and it worked, praise the Lord.
(Never shoot a warning shot into the air! what goes up, must come down, and people have been killed like that before.)
Owning a firearm, gives you options. It buys you time when time is short. Time for the fam to get to the safe room perhaps, whatever. Gives you time to think about how to control the situation.