Why Is The Holocaust the Only Genocide for media?

I do not doubt for a minute that Nazi Germany under Hitler, Himmler and Goebels commited the murder of, depending on whom you use as your reference, 1.5 million to 6.5 million people in the seven Nazi death camps. Of this numer the largest proportion was Jews. There also were Catholics, gypsies, homosexuals and undesireables of any description also murdered.
The question I have is why does the media, especially the Movie industry and the History channel on television, keep showing features of the Nazi genocide, but you never see documentaries about the genocides commited by people like Joseph Stalin, Mao, PolPot or the Japanese.

To illustrate the enormity of the genocides that are ignored I have include some statistics gathered from the internet.
Rummel, 1990: 61,911,000 democides in the USSR 1917-87, of which 51,755,000 occurred during the Stalin years.But first a deffinition of Democide: "Democide is a term coined by political scientist R. J. Rummel for "the murder of any person or people by a government, including genocide, politicide, and mass murder". Rummel created the term as an extended concept to include forms of government murder that are not covered by the legal definition of genocide, and it has found currency among other scholars".
In Russia under Stalin and Lenin the following murders are calculated.
1923-29: 2,200,000 (plus 1M non-democidal famine deaths)
1929-39: 15,785,000 (plus 2M non-democidal famine)
1939-45: 18,157,000
1946-54: 15,613,000 (plus 333,000 non-democidal famine)
TOTAL: 51,755,000 democides and 3,333,000 non-demo. famine
William Cockerham, Health and Social Change in Russia and Eastern Europe: 50M+
Robert J.Rummel, Professor Emeritus of Political Science and author of "Lethal Politics" has this to say about Stalin's genocide: "I calculate that the Communist regime, 1917-1987, murdered about 62,000,000 people, around 55,000,000 of them citizens. As for Stalin, I calculate that Stalin murdered about 43,000,000 citizens and foreigners. Therefore, the usual estimate of 20 million killed in Soviet democide is far off for the Soviet Union per se, and even less than half of the total Stalin alone murdered."

Solzhenitsyn, Aleksandr:Has estimated that between 51 and 60 million Russians were murdered.
A consensus of scholars seems to be forming around a death toll of 20 million. This would adequately account for all documented killings without straining credence, as all numbers are estimates.
In "The Great Terror" (1969), Robert Conquest suggested that the overall death toll was 20 million at minimum -- and very likely 50% higher, or 30 million.

Rummel blames the Japanese for 5,964,000 democides
POWs: 539,000 (400,000 Chinese)
Forced Labor: 1,010,000 (142,000 Chinese)
Massacres: 3,608,000 (2,850,000 Chinese)
Bombing/CB warfare: 558,000 (all Chinese)
Imposed Famine: 250,000 (none in China)
Rummel also estimates that General/Prime Minister Tojo Hideki was responsible for a lifetime total of 3,990,000 democides.

People's Republic of China, Mao Zedong's regime (1949-1975): murdered 40, 000 000 Agence France Press (25 Sept. 1999) citing at length from Courtois, Stephane, Le Livre Noir du Communism:
Rural purges, 1946-49: 2-5M deaths
Urban purges, 1950-57: 1M
Great Leap Forward: 20-43M
Cultural Revolution: 2-7M
Labor Camps: 20M
Tibet: 0.6-1.2M
TOTAL: 44.5 to 72M source: Twentieth Century Atlas and the
Guinness Book of World Records:
Although nowadays they don't come right out and declare Mao to be the "Top Dog" in the Mass Killings category, earlier editions (such as 1978) did, and they cited sources which are similar, but not identical, to the Glaser & Possony sources:
On 7 Apr. 1969 the Soviet government radio reported that 26,300,000 people were killed in China, 1949-65.
In April 1971 the cabinet of the government of Taiwan reported 39,940,000 deaths for the years 1949-69.
The Walker Report lists: between 32,2500,000 and 61,700,000 killed.

With these kind of numbers there can only be one reason why Hollwood and their ilk prefer to pound away at the Germans. They are all subliminaly if not actually pro-Communist, and all the numbers in the world would not change their position that Fascism is the great threat not "misapplied" Communism!