It doesn’t matter. It doesn’t have to be a plot. One man is sufficient to cause lots of death and mayhem, as we have seen. The Times is a bunch of dissembling fools.
a secret plan or scheme to accomplish some purpose, esp. a hostile, unlawful, or evil purpose: a plot to overthrow the government.
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This is one definition of the word plot, this can be done by one person, a plot does not necessarily have to be a conspiracy. A plot can be one person’s secret plan involving no others.