[quote=@The Muse of Eru]
I don't think anyone intended for the vampire to be accepted with open arms. Hence the need for charms and the mention of it being similar to the Lupin situation. He was accepted by the headmaster, but kept his secret from the general narrow-minded populace. 
[/quote]

Not really narrow-minded. Having dangerous sub-humans in a place where children are taught is a serious safety issue.