I'm not throwing away the humanity of Nazis. I'm acknowledging that their goal in life is to eradicate me and people like me, and that anything I can do to slow them down might save a life at some point. Time spent fixing the lawnmower is spent not agitating to have people tortured.

Tolerating certain politics as just "differences" in opinion is a luxury for people for whom politics are an intellectual exercise and maybe impact their bank statement at the end of the year, it's not affordable for those for whom it's a question of survival.