bear in mind that i'm pulling from memory here, so i may very well be mistaken. however, if i remember correctly, one of the ra readings addressed this "home density" question and touched on the whole children thing in that 5th-density natives feel the "wrongness" of this density instinctively. they have an extra-strong dose of that "i can't put my finger on it but something's just not right here" feeling that many of us get and, feeling this, many decide that it would be inappropriate to bring others into such an "out-of-kilter" environment. so it's not ruthless; quite the opposite. it's rather compassionate. as for sixth-density indicators, i'm afraid you'll have to dive into the readings. :d