The Japanese idol culture is very hard to relate to if you never see firsthand how this idol media is consumed by the "intended market". An idol means she is "everyone's idol", and that is, simply, how they are marketed. The customer base expect this, and the market provides. It's simple business transaction, which means the customer expects to get what they are "promised", and "unpure" idols are broken merch. Of course they want "warranty" back.
You don't agree with the moral implications? Well they don't care, money talks.