OK, you're right, one well described use. You remember what other instances? I get American Rifleman that runs that home defense column monthly, I don't remember of any but I admit I don't concentrate on those numbers.
NSSF estimates 5-10 mil ARs in US. Say, there are 100 cases of AR use in home defense that we don't know / don't remember of. That's a historical 0.001% chance of that rifle being used in HD. I think that, in a context of this thread, the question is still valid. Is owning AR a LARPing?
Note that I am not stating that it is, I am simply trying to establish a minimal definition, based on use probability and p-f.com opinion of that.