Williamson is despicable, IMHO, for his Holocaust denial. Holocaust denial, contrary to some’s opinion, is not just about Jew-hate. It is the denial that 6 million Jews and 6 million other folks, including Catholic priests and nuns, handicapped people, Rom, Slavs, political prisioners, and others were killed by the Nazis.
As he is a priest, he is denying that the Nazis killed his brethern for defying them.