And what's to keep any survivors from the first attack from coming back? You never, ever want to appear weak in front of a predator, hell, even a scavenger. Even if you do fight them off once, by that point you'll have riled them up, and they may feel they can take you a second time, as you really weren't that strong, you just got lucky, or used tricks. I'd rather keep a low profile, but make it apparent that if you come at me, you will die, than ever hope to "lure them in".