Another benefit to shotguns is that when you rack them, the resulting sound will usually equate to sheer terror for most burglars—assuming that's what they're there for.
To rack or not to rack in a home defense situation is actually a somewhat debated topic. By choosing to rack, you're essentially giving up home field advantage in hopes that the intruders run. If they don't, you've just made your tactical situation far worse by announcing your position.
That said, if you're so committed to not taking life as to use less-than-lethal rounds in a shotgun (which I wouldn't recommend), you may as well rack it if confrontation is inevitable.