The vampire is a complex being. Part of it still believes it's human, born of loving parents, an integral part of that endless fleshy fabric. This part makes vampire society possible. The other part knows better.
Every vamp knows that part intimately, for that is whence the Hunger comes from, but it is rarely discussed in civilized circles. Partially because, as stated, that part really knows better, and partially because losing control of the Beast leads to the mother of all vampiric faux-pas: the Frenzy.