Obviously those folks did not realize that even young Bison are unpredictable, temperamental and dangerous-when my brother and I were kids, an uncle had a “pet” Brahma bull that was supposedly “gentle”, but the creature chased us over fences, across pastures and up into trees every time we ventured within sight. And that was just a garden variety, domestic bovine...
When I was only a little kid, my uncle had a mean old Bull that chased me out of the pasture.
The next time I came to visit, we ate him. (the bull, not my uncle).
Mom and Dad were worried what I'd think, me being only a tad. I didn't care, thought that the steak was delicious. And, it was an excellent lesson for me in how the food chain works. :-)