French President Emmanuel Macron called for international regulation to curb the spread of ideological extremism in Western democracies, chiding tech companies and political correctness for allowing it to flourish.

Speaking to a group of reporters inside the Élysée Palace, Mr. Macron said the storming of the U.S. Capitol was a sign of the West’s failure to rein in social media platforms, allowing them to become incubators of hate, moral relativism and conspiracy theories.

The French leader chided tech companies—without naming them—for giving former President Donald Trump a platform to “spread hate” for years before taking action. Twitter Inc. banned Mr. Trump’s personal account in the aftermath of the Jan. 6 Capitol riot, citing the risk of further incitement of violence. Facebook Inc. announced a temporary suspension of Mr. Trump after the riot before extending that action indefinitely.

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