
. Thanks.
On topic: Vampires are a naturally deceitful, ambitious and power-hungry bunch. While there are some who feel as if they can live off in caves, there are a good number of those who live within castles, palaces and political offices to gain more power. In the process, they see lesser vampires as base creatures to be destroyed and weeded out. The Order clan calls other vampires barbaric savages(inbook and ingame such as Janus Hassildor). Sybille does too, as I mentioned already. They also seek to empower themselves at the expense of others, as we could see in Harkon's court.
You can say they are powered by treachery. The vampire on vampire relationship is always a dangerous game. Trust is encouraged even while it is sabotaged; loyalty is mandatory even while betrayal is prized; suspicion is more or less nourished even while honesty is praised. In any case, it was survival of the fittest.