I think what probably gets me deeply into my feelings about this “JKR should have just made her students Of Color to start with, she can’t ret-con and pretend she did it right the first time” is that I grew up with Anne Rice and Anne McCaffery, two female fantasy writers who hated headcanons and fandom and sued people for deviating from their original vision or doing any kinds of derivative works without their express contractual permission.
I feel like people who get irritated with her about defending black!Hermione don’t appreciate how much healthier JKR’s attitude toward the inclusivity movement in her fandom is than theirs was. Or Moffat’s is. Or Gatiss’s. Or Whedon’s. Or Green’s. Or even, until very recently, Lucas’s.
She’s not a PCR, but goddamn, at least she’s passing us the milk rather than pissing in our cornflakes.