This is so sad. I would definitely want him "quarantined" from my own, as you did. And, everyone has x amount of resources and priorities. If it were me, no, I could not put the poor creature down unless I knew he could not be saved. I would just want to know he was disease and worm free - then I would give him a chance w my own. But, if there were some other pressure in my life where I just could not do this....I would pray that a rescue facility would open their hearts to him.