Why pick on "To Kill a Mockingbird"?

The book, set in the late 30s (for context) is about courage, compassion, and gender roles.
I wonder how many young men went to law school in the 60s aspiring to be Atticus Finch?
I read it as a kid in the 70s and thought it was a truly great and thought provoking story.
My kids read it when they were in school (required reading) and it was one of the few mandated books that they really liked.
The book won the Pulitzer prize.

Recently, a couple of schools in my area, without much fanfare or notice, removed this book from their libraries.

How is it that a Pulitzer prize winner becomes one more victim of PC?
Plus, who are the truly ignorant?
The vanishing breed of folks who are represented by Bob Ewell, or the folks who imagine that To Kill a Mockingbird contains some sinister racist message that needs to be suppressed at any cost?

Well, at least they didn’t burn it. That will probably come later.