COMMENT

Every once in a while a photograph of a migrant's tragic death (usually that of a child) catches the public's imagination.

The image of 3-year-old Alan Kurdi, fleeing from the Syrian civil war, dead facedown in the surf on a Turkish beach in 2015, triggered a wave of sympathy that ended with Germany opening its borders to 900,000 refugees that year – and Hungary building a border fence to keep them out.

Here we go again. A picture of 23-month-old Valeria Martinez, tucked into her father Oscar's T-shirt, both dead, facedown on the banks of the Rio Grande, has

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