"How the Left fell so hard for Islam is a puzzlement," says Hugh Fitzgerald in an essay published on Jihad Watch.
It's 2017 now, and Hugh is still puzzled by this? There's no "puzzle" here. The answer is simply this:
"Because Muslims are Brown People."
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(For readers who expect or demand a more nuanced, complicated answer, or who might jump to conclusions because they haven't thought this matter through, I've posted the more detailed answer elsewhere.)