Well, yeah. She's suddenly trying to make Harry Potter some sort of international tolerance message. If I wasn't so lazy I'd source the quote where she says as much. Wait, hold on:

"She said she regarded her novels as a "prolonged argument for tolerance"."

And this, ew:

"Oh, my god," Rowling concluded with a laugh, "the fan fiction."

She had better mean time-travel fics.

Still, there's always the off chance that she really didn't plan it to shock people, and she just assumed people would know already. You can understand that as a writer you sometimes don't know whether you're communicating everything you have in your head.