These facts:
The original name of the piece was Simple Gifts.
Copland used the piece in a work of his own with another name while JW kept the original name, but you complained about JW "changing" the name when AC was the one who did just that.
I'm not sure where you get the idea that once someone arranges a public domain melody, anyone else who arranges that same melody is "copying". That has been going on for hundreds of years.
It's completely false that he added nothing new to what AC did - the first minute plus of the piece doesn't use the folk tune or anything from AC, and the arrangement of the tune is very different than the AC version. Did you even actually listen and compare both pieces?
And the reason it says "composed and arranged" is because part of the piece is completely original, what he composed, and part of it is an arrangement of an existing theme, what he arranged. First you go after JW for supposedly trying to hide that it's based on another theme, then when it's pointed out that JW acknowledged that, that's a bad thing too? And does Appalachian Spring mention that part is based on a folk tune? If not, then why the double standard? Along the same lines, after complaining that you think JW is trying to fool people you turn around and point out that he publicly said that he was intentionally using the same theme as AC.
And for the record, I'm not defending JW's piece, just pointing out the hypocrisy and inaccuracy.
I suggest you calm down about this, it's just a discussion about composers and music so I'm not sure why you've got yourself so angry and worked up about it.