The funny part is that we know the exact moment he thought of what to say. This photo was taken minutes before he went on stage:

The illiterate fuck misunderstood the poster, and then repeated what he thought it meant. He was grasping at straws for any answer at this point, because his death toll numbers were still climbing. And when his speech writers didn’t have any answers, he just started making it up. And he used this poster as inspiration.