Home defense is one of the big ones. It isn't always just one guy breaking into your home, sometimes its 3 or 5. These things just have a way of happening.
You have 5 guys and 7 rounds in the gun, you better hope your really good with whatever 7 rounds you have. Personally for a home defense weapon I want as many bullets ready to go as I can manage. 30 rounds of .223 and I like my odds a lot better against 5 people trying to do me harm. I don't want it to be a fair fight.
In any case I live in a fairly pro-gun state, and I don't think we will ever get to the sort of situation new york is in. This is a place where if you shoot a home invader, you did the right thing.