Yeah, the second amendment isn't about what you can do. I get that. So what does that have to do with self defense? Well you're I guess you're just on your own. :ws
In order to defend their home, some homeowners use a weapon. Using an excessive amount of weaponry will not help you achieve your goal of guarding your home, in most cases it will just burden you with maintenance like any other property.
People who stockpile weapons for the purpose of selling them are called arms dealers. Instead of guarding their home with an AR-15, they buy two AR-15's, or more. As far as individual rights go, this is futile. You can wield two AR-15's for the purpose of "self defense." You're going to accomplish double the firepower and walk away from a mess. That is why two guns is two too many. I am not justifying this with legal rulings because this is not a court of law. This is not a legal forum.
The second amendment says nothing about home defense, because there is nothing in the bill of rights about how a firearm should be used in the home. That's up to you to figure out, because self defense is a personal issue. If you want to treat it like a carnival, more power to you. The use of a weapon in your home has less to do with the second amendment and more to do with self defense.
https://en.wikipedia.org/wiki/Self-defense_(United_States)
Read it and weep.
Then read it again, because you might have missed something the first time 'round.
https://en.wikipedia.org/wiki/Self-defense_(United_States)