Failure to debate is just as upsetting, depending on the values of a person. Or rather, depending on whether they have double standards: for how they would want to be treated, and what treatment of others they support, by ignoring or rationalizing it.

    What kind of times are these, when
    To talk about trees is almost a crime
    Because it implies silence about so many horrors?

― Bertolt Brecht

Or as Ilse Aichinger said, "who forgets the murdered kills them once more".