How well so many of us remember. It wasn't very long ago – barely eight months – since Muslim extremists stormed the offices of Charlie Hebdo in Paris, killing 12 of the satirical magazine's editors and artists. And how well we remember, too, the hours and days that followed as the world declared its support for free expression, with hashtags and marches and T-shirts and headlines that bore the now-immortal phrase "je suis Charlie" – and believed that it would make a difference.

Apparently, it didn't.

Earlier this month, a group of Dutch Muslim youth surrounded actor Abbie Chalgoun – a self-described "non-practicing" Muslim – at a train station in Venlo. They called out, "Whore child! Just you wait. We know where you live. We know where to find you."

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