Of course the markets would react to a political assassination, but Trump would have easily been replaced by someone else and the show would go on.
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If "They" wanted to kill Trump, don't you think they would have just gassed him or something at Mar-a-Largo, or literally any other method, than use...
The main lesson, which is never learned, is electoral politics and democracy in general is only in place to make people think they have some agency....