I think the "myth" go's back to the days when most people would at least find some bread and milk in their kitchens / larders.
Today those who care for wildlife seem to have a much better understanding of it, than they did, say.....50 years ago, better comunications like this computer are I think are a great medium for spreding the word.
I know someone who runs a wildlife rescue service who use goats milk instead of cows milk, apparently is kinder on the digestion.