Let's just pretend I have a house. I live there and everyone knows where it is, it's a distinctive sort of place with lots of other people in it.
One night you decide attack it. You want to break in a do a bit of vandalism. You creep up, I'm sitting there quite happily watching TV or porn or maybe practicing. You do a bit of damage and generally make me feel a bit uneasy.
So I turn the lights off. Then various people in their own rooms in my house turn on their own battery powered torches anyway. They don't want to deal with the discomfort, but it doesn't really matter that you might see the lights in their room because my house is the biggest, perhaps the only big one around anyway.
I stand in a corridor, I run around the house and hit people randomly. I might hit you, the enemy, but you've probably gone, I might hit my family, my kids or anyone else in the house. It doesn't matter, I just want to show that I'm doing something.
It's a vague sort of plan.
I reckon it would be far more effective if I got myself a good burglar alarm and some warning systems.
Or did I miss something?