To accept the concept of legitimacy for Donald Trump in a mind that is steeped in leftist dogma would cause Cognitive Dissonance, a very painful experience. I doubt that many of “our friends on the left” will allow themselves to go through that.
Leftists must be quite comfortable living with cognitive dissonance. How else could they claim to support women's rights while ignoring islam's treatment of women? How else could they claim to support the LGBTEIEIO "community" while ignoring islam's treatment of gays and lesbians?