We sell and repair firearms and we've had people here who are so stupid that they should have been washed out of the gene pool several generations ago, but at least they only hurt themselves or the gun. They also learn that stupidity is expensive.
A friend of mine sells motorcycles and he's seen buyers drop brand new bikes seconds after they leave his parking lot, though to talk to the buyers they sound experienced. At least they are only hurting themselves or the bike.
With a live animal I would have a real problem making a sale to someone who I know wouldn't keep it properly.