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Why did Snape love dark Magic so much?

In her answer to another question, Slytherincess mentioned this from a chat with JK Rowling :

From a web chat:

Jaclyn: Did Lily ever have feelings back for Snape?

J.K. Rowling: Yes. She might even have grown to love him romantically (she certainly loved him as a friend) if he had not loved Dark Magic so much, and been drawn to such loathesome people and acts.

SOURCE: http://www.the-leaky-cauldron.org/2007/7/30/j-k-rowling-web-chat-transcript ... :)

What is it that drew Snape so strongly to Dark Magic™ that JK says he loves it?

The other dark wizard's seem to have a fixation on power, and merely use Dark Magic as a means to an end. Even their favouring purebloods is, in part a play for power over the 'less powerful' mudbloods.

So why is/was Snape in love with Dark Magic?