I stand by this point of view.
In the Fall of 1933 the Shroud was publicly displayed in the Cathedral of Turin. One of the people who saw it was Hans Scholl, a 15-year-old German vacationing in Italy. His bio says that Scholl was deeply moved by this "real icon" of Christ and the evidence of His grievous death for the salvation of the world.
Scholl returned to Germany, quit the Hitler Youth to which he had briefly belonged, and within 10 years died a martyr's death as the leader of the anti-Hitler Resistance student group, "White Rose". He, his sister Sophie, and their fellow anti-Nazi "conspirators" were beheaded in Munich's Stedelheim Prison in 1943.
I don't say the Shroud "caused" his heroism. The enlightenment of souls in a mystery in the hands of God. But I would say that anything God uses that stirs the heart, strengthens the Faith, and turns a person away from the path of evil and death, is--- well, a good thing. A very good thing.
Amen?
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Hans and Sophie Scholl, and Christoph Probst
"The White Rose"