I would only argue to say the swastika has one reference, whereas the uni-knot has many applications. So while the first thing we all think of is lynching, there can be many reasons they had tied a uni-knot that have nothing to do with lynching or even asphyxiation.
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That's a valid reaction. I think most reasonable people would react that way. Some of us are recoiling at the reaction that they should all be fired and never work again, with no explanation.