A volley of U.S. cruise missiles had barely been launched into Syria before the Internet filled up with fact-free theories about the real reason for an international crisis.

A popular one on the right-most fringes: The U.S. government actually carried out the chemical weapons massacre in Syria last week — a “false flag” to trick President Trump into retaliating, thus entangling himself in a foreign war.

A slightly more convoluted strain on the left: Russian President Vladimir Putin ordered the chemical weapons massacre to help Trump — distracting Americans from an investigation into Trump's campaign ties to Russia by provoking the missile strike.

That theory — evidence-free — was laid out on a small anti-Trump website shortly after the missile strike.

But it went mainstream Friday night, when Lawrence O'Donnell advanced similar speculation on his MSNBC show, “The Last Word.”

[‘Even the liberals were all over this’: Bill Maher disgusted by the cable news response to Syria]

...O'Donnell didn't offer any evidence on his theory, promising only that “you won't hear ... proof that the scenario I've just outlined is impossible.”

What O'Donnell did hear, if he followed the reaction to his show, was derision from across the political spectrum.

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The clip spread quickly across right-leaning sites where a writer on Twitchy asked: “Honest question: MSNBC is OK with this crap?”

The network declined to answer The Washington Post's questions about the segment, which Adam H. Johnson — a writer for the left-leaning magazine the Nation — called “a great weasel way to float bat s--- conspiracy theories.”

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...Trump lamented seeing photos “of innocent children, innocent babies” killed in the strike, which he said made him reconsider his longtime stance against intervening in Syria's civil war.

Early Friday, Trump ordered dozens of cruise missiles launched at a Syrian military airfield, marking the United States' first direct intervention in the six-year-old conflict.

If, as O'Donnell theorized on MSNBC, Putin had planned all this to boost Trump's poll numbers, the Russian president didn't show it.

Russia instead retaliated by pulling out of an agreement designed to prevent skirmishes with the United States in the airspace over Syria.

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