That's the problem right there. On the one hand, victims are often too young or intimidated or traumatized to press charges at the time. On the other hand, by the time the damage is released enough to enable the filing of charges, the evidence chain (if there ever was a verifiable one) is long gone - but the accusations can still destroy the innocent.
Bad all around. I see no clear answer except that the law much somehow remain locked to evidence, especially if the statute of limitations is extended.
Well said.