Fue en una entrevista a JKR, aquí está textual la parte en la que comentó sobre el fanatismo extraño por Draco (que bueno que la pude encontrar xD):
MA: What does it do to you to see a character that you love, for people to express sheer hate -
ES: Or vice versa.
JKR: It amuses me. It honestly amuses me. People have been waxing lyrical [in letters] about Draco Malfoy, and I think that's the only time when it stopped amusing me and started almost worrying me. I'm trying to clearly distinguish between Tom Felton, who is a good-looking young boy, and Draco, who, whatever he looks like, is not a nice man. It's a romantic, but unhealthy, and unfortunately all too common delusion of - delusion, there you go - of girls, and you [nods to Melissa] will know this, that they are going to change someone. And that persists through many women's lives, 'til their deathbed, and it is uncomfortable and unhealthy and it actually worried me a little bit, to see young girls swearing undying devotion to this really imperfect character, because there must be an element in there, that "I'd be the one who [changes him]." I mean, I understand the psychology of it, but it is pretty unhealthy. So, a couple of times I have written back, possibly quite sharply, saying [Laughter], "You want to rethink your priorities here."
La fuente es esta: http://www.mugglenet.com/jkrinterview2.shtml
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Date: 2008-09-17 03:56 pm (UTC)MA: What does it do to you to see a character that you love, for people to express sheer hate -
ES: Or vice versa.
JKR: It amuses me. It honestly amuses me. People have been waxing lyrical [in letters] about Draco Malfoy, and I think that's the only time when it stopped amusing me and started almost worrying me. I'm trying to clearly distinguish between Tom Felton, who is a good-looking young boy, and Draco, who, whatever he looks like, is not a nice man. It's a romantic, but unhealthy, and unfortunately all too common delusion of - delusion, there you go - of girls, and you [nods to Melissa] will know this, that they are going to change someone. And that persists through many women's lives, 'til their deathbed, and it is uncomfortable and unhealthy and it actually worried me a little bit, to see young girls swearing undying devotion to this really imperfect character, because there must be an element in there, that "I'd be the one who [changes him]." I mean, I understand the psychology of it, but it is pretty unhealthy. So, a couple of times I have written back, possibly quite sharply, saying [Laughter], "You want to rethink your priorities here."
La fuente es esta: http://www.mugglenet.com/jkrinterview2.shtml
La parte que cité está por el final de la página.