Comment: In this case, "laughing" doesn't mean

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In reply to comment: I don't believe for a second (see in situ)

In this case, "laughing" doesn't mean

funny ha ha. It means to hold in derision. The kings of the earth plot and scheme, thinking they are so big, so important, and that they are the absolute zenith of power, but God laughs at their swaggering self-importance. They are like ants having a giant ant battle on the sidewalk to God, who created, controls, and directs all things.