Lacking that, they cannot tolerate anything that is good and holy. They cannot even sustain themselves without feeding on the essence of others.
There is nothing sympathetic about them, and I don't ever want to see another movie from the vampire's point of view. They are purely evil. Anne Rice's whiny Lestat forsakes the essence of vampirism. No true Undead would ever bemoan the loneliness of his existence or feel betrayed by his would-be victims. Regret and sadness are for beings with feelings, and feelings arise from the soul. Vampires have none.