This is not a good argument: "We didn't know about X in 2015 when it was happening, but we know now, so we hate the current guy for continuing it, but not the previous guy for starting it."
Because there's a demand for reasons to hate Trump. Hating Trump is the goal; none of these people actually give a crap about migrant children per se, but it's a cause that's safe to rage about, like sports.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.