Other leftists KNOW what the effects are, and intentionally promote policies that are destructive in order to gain power in the long run.
FR threads on the topic:
Stupid Left vs Satanic Left
Stupid Left, Satanic Left
Some leftists are ignorant of the effects of the policies they support, preferring instead to “feel good” about what they think is the intent - “helping the poor”, “social justice”, “equality”, etc.
Other leftists KNOW what the effects are, and intentionally promote policies that are destructive in order to gain power in the long run.
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I’m of the school of thought that asserts that leftists can be both stupid AND evil at the same time - the Syncretic School.