Using mink meat for pet food is probably very close to why the 'noble' American Indians "used every part of the animal"
After eating the 'good' parts, they were left with, well, leftovers. Some brave soul tasted the brown muck in a broken bone, and said it was food. Someone found a use for the bones, and the sinews, and I'm sure there was still some parts "left over" after each kill - things they _could_ use, if they needed it, but didn't at the time.
I don't think waste is inherently good, but there are always by-products to any construction/manufacturing.
When I was in college, I worked for a small construction firm. After building a house, from wood-frame construction, board & batten (wood) exterior, and knotty pine interior walls (the only sheetrock was in the bathroom and furnace room) we had a LOT of scrap wood to burn at the end of the job. And sorting through the pile of scrap looking for a usable 11" piece you need to trim was POSSIBLE, but - at $0.55 per foot at the time, if it took you more than 6 minutes, it was a monetary LOSS (the job paid $5/hour) for the company.
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