Answer

I no longer remember what I wrote or where I wrote it. It seems to me that there is some justice in this comparison (and it seems to me that I once wrote that too), but also a bit of demagoguery. There is a difference between the two sides of this equation.
Someone who does not believe in the Sabbath is not supposed to honor it. There is no reason that those who cherish the Sabbath should be able to make demands of those who do not. And if they do make such demands, it is no wonder that people protest against it. By contrast, Memorial Day is about gratitude toward people thanks to whom we all live here. That is an obligation on everyone, regardless of worldview. No one denies the value of gratitude toward someone thanks to whom I am alive. I assume that if Haredim chose to commemorate in a different way rather than by standing for the siren, even though in my opinion that is nonsense, people would accept it more readily. But contempt toward the remembrance itself (and not only toward the manner and form of remembrance—”the ways of the gentiles”) is ugly, and there is no reason to accept it. By contrast, there is nothing ugly about not honoring the Sabbath. That is a matter under dispute.