Why would killing Lucy, Mina, or any other vampire have been considered a merciful act of euthanasia?

Euthanasia is merciful killing.

Explanation:

The Killing of the vampires is merciful because then the person's soul is released from being a vampire so they can go to Heaven and not keep being a vampire anymore, they were becoming monsters and they wouldn't want to hurt anyone. And by killing them, you are putting them out of their misery.

answer; lorenz;