Note by @cookingsteak

If rpf of adults is fine but children is not, then that means acknowledging that rpf does somehow cause harm. Which it doesn't, because it's fiction. So both should be fine. This isn't a two way street, really, but being uncomfortable with one or the other or rpf in general is also fine. I will defend the existence of rpf in any form, because it's happened for years. I am pretty sure the Bible is rpf.