Rant of a queer witch

Why is there only a good witch and a bad witch in The Wizard of Oz?
Why not a not-so-good witch and a not-so bad witch?
Or a sometimes-fair and sometimes-not witch?
A maybe-so witch?
A you-never-know-what-she-has-up-her-sleeve witch?
A middle-of-the-road witch?
A little-bit-of-this and a little-bit-of-that witch?
A she’s-having-a-bad-day-so-you’d-better-watch-out witch?
This is why I call myself an intuitive witch:
I respond to my environment.
In nature there are no species that do not branch off
into sometimes innumerable breeds.
So what is it with these binaries?
Speaking of witch (W-I-T-C-H),
why wasn’t the wizard a drag queen?