Anons argument was that the children want to marry 30 year olds because of social status, and children being sold by their parents to wealthy predators doesn't support that. Maybe some "chose" that kind of situation in the face of destitute poverty and starvation, just like people "choose" to take predatory loans and be taken advantage of. You could get a toddler to willingly wander away from their mother with a chocolate bar, that doesn't mean it's not predatory or that society doesn't have an interest in preventing you from doing so.
What you don't seem to get is that the problem is not strictly biological, it's about the power imbalance inherent and necessary for that kind of relationship. IDGAF what fantasies and cartoons you jack off to, but seeking out a relationship that's entirely reliant on such an extreme power imbalance is purely predatory and it's that's what I mean when I call you socially stunted. I would say the same of aristocrats that grow up surrounded by servants and without consequences for any behavior and thus freely prey upon those they have power over.
You just chafe at the age of consent and call it arbitrary because it puts a check on that power imbalance, but no matter what smoothbrain "grass on the field" argument you make, it will never be in a childs best interest to have a romantic relationship with you or and grown adult, and this isn't debatable at all. Child brides have pretty bad lives and as they grow up, that power imbalance that enables the relationship strains and any illusion of consent evaporates.