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Since you have dealt with a mentally ill person, you are better prepared than most to deal with Leftists.

OP writes, "I can't even wrap my head around this." Sane people CANNOT understand INSANE people. They are utterly illogical and unreasonable. Do not waste time trying to understand it. For your own sanity, do not waste precious time trying to debate the mentally ill. You might as well debate a bag of potatoes. Instead, concentrate your efforts on IDENTIFYING those who have it and DEALING with them appropriately.