Thing is, any substantiative discussion will be way too complex for most people who could fall to these conspiracy theories, to understand, and they will arrive to a conclusion like "these Jews are trying to look too smart and bullshit us".

Sadly, this asymmetrical warfare from authoritarian nations hits the right point: it forces us to either let misinformation flow and people become manipulated by it, or to revert to authoritarian measures by gradually chipping away freedom of speech.