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?

I have pictures of relatives who died in the Holocaust. Do I believe it happened? Yes. Do I give a shit? No.

As far as I'm concerned, everybody on the planet is a dick. And everybody acts like dicks to each other all the time. The Holocaust was just a major milestone in dick history. Big dicking deal. The moral of the story is to stop being dicks. But nobody gives a dick anymore because they're too busy with their little dick lives. Dicks dicks dicks.