To most, the vampire pony is just a story, a myth passed down through the generations to entertain ponies. To six, it was an example, a reason to never try to change what nature had created. To a select few though, they are real. Fluttershy is one such pony, and she sees them as a bad thing. What do you do with bad things? Get rid of them.
neat, like the hellsing reference, personally would've preferred a more traditional dark brown hate and duster but thats just me