Let the Right One In

Is an endangered species (vampires) that endangers another species (humans) justified?
If vampires exist and are endangered, would humans strive to protect and feed them?
Is it monstrous to kill monsters, or to not kill monsters?

Humans endanger other species too,
while protecting some.
Why the speciesism?

Is a single vampire who kills only to survive
more morally justified
than many humans who kill animals when they can be vegans?

Many humans are like the child bullies in the film
who endanger isolated kids (and animals)
in the absence of grown-ups; not being grown up in humanity.