agree that the holocaust deniers should focus on other things than that as obviously a tragedy of large proportions happened to Jews in Germany, etc. (debating the number killed is sick, IMO, though people shouldn't be locked up for denying it, like is happening in Europe) Why it happened is another question.
See:
Neturei Karta - Orthodox Jews United Against Zionism
Ten Questions to the Zionists
but IMO the word "conspiracy theory" has undeservingly been given a bad name.
It is simply
conspiracy theory. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
"A theory seeking to explain a disputed case or matter as a plot by a secret group or alliance rather than an individual or isolated act.
So, yes, I don't mind being called a Conspiracy Theorist, because I am and do it as a hobby.