The Holocaust is the most thoroughly-documented war crime in human history.
Its horrors were meticulously recorded by the Nazis themselves.
There's 50 million documents in Germany's own Bad Arolsen Holocaust Archive.
The Germany government had to build 26 kilometres of shelving in four buildings just to hold it all.
And that's hardly the only repository of Nazi wartime documents proving the Holocaust happened.
Plus there's all the proof captured by multiple Allied Armies - American, British, Canadian & Soviet.
Proof such as Nazi death camps, camp guards, and still more documents.
All those WW2 Veterans had no reason to make up the Holocaust and spend the rest of their lives lying.
More to the point, no power on Earth could make them. Especially not when they lay dying of old age.
Then there's all the people of the nations of Occupied Europe who also saw the proof of the Holocaust.
People who saw the camps. Who saw the survivors. Whose governments also captured documentary proof.
Then there's even more compelling proof.
Like the admissions and diaries and confessions of Nazis who participated in the Holocaust.
Some deniers pretend those Nazis were tortured into giving false confessions.
But like the Allied Veterans who liberated Nazi death camps, there was no power on Earth that could keep them silent for the rest of their lives if they'd been lying.
And the fact remains none of the Nazis ever recanted their confessions, not even on their death beds.
Including ones still alive in the modern era like this former SS officer:
"Oskar Groening, 94, nicknamed the "Bookkeeper of Auschwitz," may be one of the last people to face trial in Germany for Nazi-era crimes. He trained as a bank clerk before joining Germany's SS military unit as a soldier.
A judge in the northern German city of Lueneburg convicted Groening for his role at the camp following testimony that he presided over prisoners' belongings and collected their money before they were marched to their death in gas chambers.
He did not dispute the charges and admitted "moral guilt" for the atrocities."
Link - http://www.usatoday.com/story/news/world/2015/07/15/former-auschwitz-guard-oskar-groening/30176313/
So Lord only knows what's mentally and morally wrong with idiot Holocaust deniers.
Maybe like your buddy Kenny they're all just stupid drunks that need to go to AA and smarten up.
He can't be as smart as you think if he let himself get addicted to booze.