Why now? Because it's no longer enough to say that attraction to young girls is not currently considered appropriate. We must pretend it never was. We can't even tolerate light-hearted humor about it.

"Every record has been destroyed or falsified, every book rewritten, every picture has been repainted, every statue and street building has been renamed, every date has been altered. And the process is continuing day by day and minute by minute. History has stopped. Nothing exists except an endless present in which the Party is always right."
(George Orwell, 1984)