Why do people still believe in the Holocaust?

Can someone please explain to me why everyone's expected to agree with the official story about 6 million Jews being killed under the Third Reich?  I mean, in many countries, it's criminal to even *question* the idea that something might be wrong with that claim.  And you basically get blacklisted everywhere for doubting it, being labled as a denier.

I've done some research on this, and there's actually a pretty solid case that there was no so-called "Holocaust".  One that I agree with, in fact.  Here's an example of an excellent debunking:

http://www.ihr.org/books/rassinier/debunking.shtml

So, with a case that solid, why is it such a big deal?  Why do people believe that there was a Holocaust?

Why don't white nationalists stop making asses of themselves by saying the Holocaust never happened?  It's more credible to say "the media tends to glorify the Holocaust over other incidents of mass murder" and point out where and when this happens and how it should be stopped.  Then again, most white nationalist arguments are immediately labeled as whacko hate group theories, so maybe it's better to leave the arguments to the professionals.  For example, criticizing Israel works better when the person making the argument has no ties to white nationalist groups.  People who do have an association with these groups and argue against Zionism make it easier for the media to say all anti-Zionism is racism.  At least the Internet makes it easier to make arguments, but having the word white or blanc in your URL doesn't help with credibility.  The general masses should be the ones finding the Holocaust industry distasteful.