I think the OP's point (or part of it) is no one gave a hoot until the horse was in the kill pen. Then all of a sudden folks were ".. Ohhh.. we have to SAVE the precious little horsey from being killed!!.." even though (according to information given) the previous owner appears to have used that as a last resort. Then, that same horse appears to be a bit much for them, and the folks now, essentially, "want their money back" and pawn it off on someone else to "rescue".
I once had a dozen or so horses dropped off at my place- literally, dropped off. They showed up one day,and I coudn't get rid of them. They were wild, unhandeled, bad mannered and dangerous. According to the sherriff, unless they looked malnourished or neglected, they wouldn't take them- and if if they did I could get charged, since they were now my property. (Uh.... huh?)
(Kill pens and such weren't open, but they were good candidates, most of them anyway).
The rescues were full, I was on my own. I tried giving them away, with full disclosure. The only thing I did was get the stallions gelded, and wormed. I couldn't afford to get all their feet done, all their dental, etc- wasn't going to happen. Luckily, they maintained weight on pasture alone.
Oddly enough, no one took them. (Imagine that).
So, I tried a different approach- I sold them. 200$ a piece. Miraculously, people wanted them. SAME horses, in the SAME shape, SAME disclosure. Apparently, sticking a price on them makes them worth it (I still don't understand). Took me 3 years to find these guys places to live. (I wouldn't give them to anyone I didn't think could handle them, otherwise the horse was no better off. I had, at least, by that point got them to where they weren't completely dangerous)
You put them in a kill pen, and everyone wants to save them, regardless of trying to help them before that point.
People psychology baffles me.