Outside the U.S., and even in some circles inside the U.S., anti-Americanism is a popular and cheap status-signaling attitude. (Moldbug wrote a good analysis of the phenomenon a while ago.) Clearly, in more sophisticated circles it usually has subtler forms, but among the common folk it often has rather crude expressions such as this one.

Similarity to the Reichstag Fire and the subsequent Enabling Act perhaps? The Reichstag fire probably wasn't laid by the Nazis themselves either, but since they enormously profited from it politically many people believed (and I guess still believe) that they did it.