As Pope Benedict has written, though the SS was a movement of atheists (and occultists), the sad fact remains that most of them were also baptized (be they protestant or Catholic). This certainly provides an opportunity to explore the reasons for this apostasy (the paganizing Renaissance, the Reformation, the French Revolution and the rise of a virulent atheism and anti-Christianism).
Bishop Williamson could also develop the links between various forces of totalitarianism - Nazi, Soviet and the contemporary phenomena of the dictatorship of relativism. He could touch on the rise of "mercy killing" and compare it to the extermination of 70,000 physically and mentally handicapped Germans by the Nazi regime prior to the commencement of the War.
He could explore the Molotov-Ribbentrop Pact which partitioned Poland and paved the way for the extermination of Jews. He could explore the facts behind Nazis training in Soviet Russia prior to the war; he could explore the NKVD and its leading "lights" and how they inspired the SS. For example he could reflect on the similarities between psychopaths such as Himmler of the SS and Beria of the NKVD. He could discuss Katyn and how this atrocious act set the precedent for similar Nazi exterminations in the east. In all of this he could point out how the Soviets led and the Nazis followed. He could also discuss the terrible silence of western collaboration (through denial and silence) with the Soviets.
He could also explore the various other genocidal acts that took place and are so sadly forgotten and even denied: the Armenian Holocaust, the Holodomor, the Gulag (Leninist and Stalinist) Cambodia, the Cultural Revolution, the Tibetan Annexation, the Palestinian Refugee Crisis, the Rwandan, Chechen and Sudanese Genocides - as well as, what can only be regarded as a new Holocaust: the Chaldean Holocaust (where, since 2003 the vast majority of Chaldeans have been exterminated, forcibly "converted" to Mohomedanism, or - if lucky - have fled the country). On this issue, as with so many others there is a deathly silence. Finally, he could conclude with the "Silent Scream" of millions of souls lost through the unspeakable crime of abortion.
He could draw his final conclusion: this is not because of religion, it is because of lack of religion. It is because mankind refuses to bend the knee to the Prince of Peace, to realize that true peace is the tranquility of order - the order of Christ.
What a glorious opportunity with the world watching! What a defeat for the secular press which despises Christ and His Church. What a defeat for satan.