I have googled the Comtois horse and a couple of websites came up that rescue them from the meat farms in France and I must admit I did consider it but I think you might be right about it being misguided kindness. Also, a rescue probably would be right for me as I am looking for a confidence giver!
I discovered the Comtois purely by accident whist on line and just fell in love with them! Also, as you can tell by my name, I am pony mad and although I would like something a bit bigger for my second horse I don't want anything too tall but do want something 'chunky' and sturdy and I read that Comtois should be between 14 and 15hh which would be just right for me and they certainly are 'chunky'! They are just so beautiful and having researched them they appear to generally have a very nice nature.
I have seen one on Horsemart, might be the same one you mentioned because it was advertised with another but I think they were asking £4000 and also it was a mare and I would prefer a gelding. £4000 is out of my price range although I'm guessing they will all be out of my price range!!! Oh well, it's good to have a dream!