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."
People want a socially-sanctioned outlet for unhinged rage, ie they want to be _righteously_ angry. When you're in the grips of a malignant ideology and you're not very bright, that means raging at whatever your friends are, unreflectively.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.