Ah, then I see my point of confusion: I do not see “nothing matters” as a fundamentally undesirable position (actually kind of the reverse), so to me Donald’s statement does not read as despare at all, it just reads as a neutral explanation of his stance on it. As such, Mickey’s statement doesn’t read to me as absurdist reassurance, rather, Donald’s reads more as something an absurdist might say and Mickey’s response reads more as “how dare you believe that, that idea must be somehow made false even if it is true and I wish to use violence to bring that about”