well, the exact opposite of what you are saying is true, but yunno, children and adults love fantasy. yunno in harry potter the wizards have a spell (like men in black as well) that makes you forget. so i propose to you that harry potter is a documentary. i mean, the detail, its is so intricate and surely it is real. you cannot prove it isnt. any evidence for the witches and wizards is erased from the minds of the muggles by order of the ministry of magic. so there is a decent chance that you have even seen one of the more prominent wizards doing something awesome, but they cast the forget spell on you. how would you know? either you believe or you dont, right. 50/50 chance, as bud lee would say.
i dunno what point of yours you think merits rebuttal. you demonstrated that things exist even when dont see them? yeah, we know. this is a skill even babies have.