In some cases, a .570 double would be ideal for home defense.
First off, there's no such thing as a commercial .570 cartridge in production today for double rifles, so you'd be using custom ammo that you could tailor to your own requirements.
Second, being a double, there wouldn't be any of the current stigma that hunters like Jim Zumbo attach to semi-automatic rifles.
Third, one-shot stop percentages ought to be very high.
Fourth, if an elephant in
musth escapes from the local circus, you'd be ready.
Go for it!