Rescues are not dumping grounds for people who want to get rid of an animal that has gotten too old, is crazy, requires expensive medication, or is lame.
Rescues need to remind people that they're NOT free retirement facilities, and if the owners can't find a home for their unwanted critter, what makes them think rescues have some sort of magic power to do so?
If you can't afford your horse or just don't want to, and it's not sane, sound, and rideable, do us all a favor and put down the poor brute. Waiving off what is ultimately YOUR responsibility makes you look like a moronic assbucket.
This topic really frosts my tuna. These are the same folks who will blather on and on about 'no slaughter for the pwetty horsies', but won't hesitate to foist off poor old Sparkplug onto a rescue and convince themselves that they're saints for not selling the beast at auction.
Put on your big girl/boy panties and take some responsibility for your own animals! Don't expect someone else to be willing to take on your problem, especially if that facility is already full to bursting with unadoptable critters.
Sorry, I'll get off on a tirade about this if I'm left to my own devices. People like that are the lowest of the low, in my mind.