felt like a thief

For my store's credit card purchased returns, it'll only go back on
THAT credit card, or a cash card.

Your friend should go to the store with his credit card and return the
camera. Stores usually want the original-purchase credit card in
order to process a return.

And I see you haven't learned from your last train-wreck of a letter.
You're still swearing, and there are basic misspelled words (thieves,
not thiefs; their, not thier; etc.).

but no one treated you like a thief. They said they felt the camera
had been abused/mishandled, not stolen.

But I have to ask, were you looking to EXCHANGE the broken camera or
just return it? That would make me suspicious too if a customer
wanted to return a defective item and was not planning on buying
another one. I'd have to wonder if they had used it for one event,
mistreated it and then wanted to take it back and get all their money
back.

The fact that you are here accusing them of "treating you like a
thief," cursing and attacking anyone who responds in opposition to
your letter makes you appear that much more suspect.

a lot better response. I would be ashamed to send a letter like this
and truly expect a decent response.
And, was it a month or 2 weeks?
And swaring only makes it worse. Totally unnecessary.
And gets you no brownie points.
Honey gets more that bitter.
No one MAKES you feel anything. You decide your own response/reaction
to a given situation.
Count to 10 and write again.

lack any real feelings.

And the whirring and vibration are just downright distracting.

you can't spell, you can't string together a coherent sentence, you
called them names and you have zero grasp of proper grammer. no one
will pay one whit of attention to this ridiculous diatribe. my only
question is, what the heck are you getting so upset about; it isn't
even your camera, which makes it none of your cotton pickin' business.
let "the kid" handle it.

the hell are you cursing for?

1) Drop the curse words. "hell" does not belong in a business letter

2) Sorry you have bad eyesight and that your grammar/English skills
are not good. But you have no right to take it out on us. We're trying
to provide you with constructive criticism.

Long story short: drop the attitude and you may be surprised at how
far it can go.

Other readers will miss out on some of her vitriol. (But I understand
why the comments got yanked.)

Something doesn't quite add up. You (singular) returned a camera, and
later state "her (sic) made us (plural) feel like we (plural) were
thiefs (sic)", then you state "This kid is out nearly $200."

Maybe the "kid" could get this resolved himself, or at least write a
business letter without using foul language,

Huh?

You write a letter like this and you call them "mornons"?