I'm not sure what DDR stands for.
What I'm saying is that white people in general have a great culture but they're not allowed to be proud of it in public most of the time, so there's a big hole that needs to be filled with something.
In America you have for example white people who are obssessed with Japanese anime/cartoons. They say they want to visit or live in Japan, learn to speak Japanese, dress like they're Japanese, etc. I like some of those shows too, but theres' a difference between liking something from another culture and trying to take that foreign culture on as your own culture.
There are also, as you know, white people who try to act black. They dress up in fake gold chains, listen to rap music, talk with black dialect, and wear pants that show their underwear. They are substituting what passes for black "culture" for their own culture.
I think this vampire stuff is similar to that. These people have such a cultural void that they need to fill that they make their own sub-culture and obssess to the point of destroying their teeth to make them look like vampires, drinking blood, and dressing in an odd manner.