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By Barbara F. Walter

Dr. Walter is the author of “How Civil Wars Start.”

President Trump thinks he’s sending a message. By deploying waves of National Guard officers and active duty Marines to Los Angeles, he’s trying to show that he’s powerful and in control, that anyone who protests his policies will pay a price. This is a classic deterrence strategy: hit hard in one place to scare Americans into staying home.

But this strategy often backfires. If the majority of protests in Los Angeles reject violence, Mr. Trump may end up proving the opposite of what he intended: that he’s afraid, that the protesters are disciplined and that the threat isn’t the people — it’s him.