Better to have it and not need it, then to need it and not have it.
Long as you don't go overboard, i think it's perfectly reasonable to have something to defend yourself with. Granted, i would think a reasonable amount of guns to have for home defence would be 1, but i'm european so i dunno
Not really, my family looked at me like i was mad when i suggested it. Got an out of date powder extinguisher from Volvo tho. Seems to be intact