What this later points out is that, even though 2/7 survived, the 2/7 will survive longer than the 1/2. Small families will not be exposed to danger as frequently as larger families, thus the larger families lose more of the children, but the survivors learn how to better prepare for dangerous situations, and how to avoid it.
Well, from later panels, the single child tends to favor independence sooner, but is unprepared for the harsh world. With no experience in dangerous situations, the yukkuri will not know how to survive and avoid danger.
Large families yield few survivors, but the survivors live longer because of observing their sisters die off. They learn to spot danger and become more cautious as a result.
Salem said: This story use the fan theory that yukkuri cause mental illness where human seeing them will have murderous impulse against them and then became abyuser after they tasted their first kill. It doesn't matter if the yukkuri is nice, any human seeing them, even those who think they're tolerant or even yukkuri lover, will became rabid yukkuri abyuser and unable to stop.
Therapy don't work. The therapist will became an abyuser too.
Cataphract said: That would cause a mass wave of an abyuser outbreak. If that happened the world would hunt the yukkuris to extinction and everyone would go mad without being able to abyuse yus anymore.
We are all slaves to our dopamine masters.
But what Cataphract says is correct: people would actively seek out yukkuri to kill, and when they're extinct, it's likely that people would turn on small animals, then to each other, in order to sustain the brain chemistry that made them addicted in the first place.
From what I gather, single yu become more independent, but more prone to danger, thus shorter lifespan.
Larger families, the koyukkuris tend to stay in the nest longer, but they live longer because of learning from the mistakes of their sisters. Because their sisters did not survive, they learn how to avoid danger. Wisdom built on the backs of the dead.
Kind of like why roaches drop large clutches of eggs: in the hopes that one of them will be able to continue the breeding cycle.
Seriously. How wasteful are the humans in this world? I barely make one trash bag of refuse per week, and we have city-supplied trash cans for them to collect. They have one of those compactors that has an arm.