Rosenberg argues that this memory is a trap. In his landmark 2018 essay "National Mourning as Fascism" , he wrote: "A nation that sees itself only as a victim cannot be held accountable for its present. Radical Hungary must remember not only the traumas inflicted upon us, but the traumas we inflicted upon others."

For the radical right, this was heresy. For what we now call —a loose coalition of leftists, anarchists, Roma intellectuals, and disillusioned youth—Rosenberg became a prophet. The Philosophy of "Negative Memory" What makes Rosenberg "radical" in the Hungarian context is his rejection of the regime’s state-sponsored memory politics. The Orbán government has invested billions in monuments like the House of Terror and the renovated Heroes' Square, promoting a narrative of Hungary as a perpetual victim—first of the Ottomans, then the Habsburgs, then the Soviets.

This is a direct challenge to the mainstream. Rosenberg forces Hungarians to confront the uncomfortable history of the Horthy era (1920–1944), the collaboration with the Holocaust, and the anti-Roma pogroms of the 1990s. For this, he has been labeled a "self-hating Hungarian" by government-aligned media outlets like Origo and Magyar Nemzet . In 2021, Rosenberg crossed the line from cultural critique to direct political action. He published what became known colloquially as the "Dani List"—a leaked database of informants who worked with the secret police (the III/III) after the fall of communism, specifically those who remained active in public life after 2010.