A rabbi ought to have a position on blood libels.

Why only on blood libels? What about other historical issues? And scientific issues? And in general, every topic in the cosmos.
In any case, you’ve convinced me. God willing, soon I’ll write a survey of all the blood libels and say what I think about each one. In general I can already say that I oppose blood libels. Is that enough for you?

I meant that even though factually Jews really are happy on Passover for 8 days, and that’s well known.
Even though factually Jews are happy when a gentile dies and sad when a Jew dies.
And even though on this holiday they drink 4 cups of wine 3 times. (first Seder night, the second festival-day Seder night in the Diaspora, the Messiah’s feast on the last day of Passover) and eat piles of matzot, and that’s well known.
Even though factually a dead non-Jewish boy indeed was found when the snow thawed out (not only that, but let’s ignore the minor details).
Even though factually it is known throughout the whole world that they also need some for the matzot and the wine.

Even so, the pogrom against them is wicked, despite the fact that in every detail of the story there is no lie.