Jim that's absolutely true, but although a 7.62 round will go through several walls and remain lethal, bird shot won't. If your kid is on the other side of the wall and you shoot they're getting peppered, but if the shot has to go through 2 walls (4 layers of sheetrock plus insulation) and whatever furniture is in the room in the 25 ft between you and your kids it's a different matter.
Bird shot wouldn't make that trip. Buck shot might, a pistol round almost certainly would. An AK round definately would.