Fantasy isn't wrong, full stop and end of discussion. But really, are people having a hard time making the obvious distinction between object and subject here? It's not a matter of severity, it's night and day. I haven't seen any NAMbLA types or the like, not in this thread anyway. The former covers one of the most universally held fantasies in the world, male and female. Latter is very rare and virtually inseparable from trauma and/or mental illness. You could discuss whether Fiona and her type have skirted around catering to said latter group, but implying that a fan must lean towards those proclivities is beyond crazy and reeks of North American-centric moral panic.
I am not accusing anybody of anything here, but I am reminded of that one weirdo in the Andrew Callaghan doc who claimed to oppose p3dos in government. Even if you haven't seen it you might guess that the guy had an extensive record himself.