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?

It's my belief that laws which make questioning the Holocaust illegal actually do more to help these tin-foil kooks.  The truth typically does not need laws to defend it - only lies do.  That makes the Holocaust immediately suspicious to many people.

That said, I still believe that it occurred, largely as depicted in the mainstream historical record.  These laws were passed out of emotionality rather than any sound reasoning or legal basis.  The guilt-ridden western democracies just shoot themselves in the foot by encouraging anti-Semitism with such laws.