At a first glance, the worst transgression of vampires appears to be their physical violence, as seen by the fact that they feed off humans, however their worst transgression is the sexuality they evoke from their victims. When Dracula bites Mina her, “white dress is smeared with blood.” Mina’s white dress is symbolic of sexual purity and the blood is reminiscent of a woman’s hymen breaking when she first has sex. When Harker is finally aroused from his deep sleep, he fears this and repeats, “In God’s name what does this mean?” and finally Mina says, “Unclean, unclean! I must not touch him or kiss him no more.” Mina has just been the victim of a sexual assault, and yet her and her fiance’s first concern is her sexual purity. So despite the physical violence Dracula causes, it was the moral violence against Mina’s soul that is of the utmost importance.
This can even been seen when the four men go to kill Lucy, and Holmwood drives a stake through her heart. The fact is that they kill her, however it is necessary because they must purify her. The cross is an antidote to vampirism because vampirism is a transgression of morality. Jesus is born to a virgin mother, and maybe the sexual purity of Jesus can somehow cleanse the sexual impurity of vampires. Vampires may be dangerous creatures but the danger of them is somehow connected to what they can evoke from their victims. This concept is reinforced in the fact that vampires are very humanesque creatures, and even feed off of humans. The fact that vampires are blatantly sexual creatures may be representative of a hidden part of humans, and one that is clearly immoral and must be suppressed.