I don't think anyone is arguing that the US government is comparable to Nazi Germany. I think the implication is that the Weimar Republic rapidly devolved into

I don't think anyone is arguing that the US government is comparable to Nazi Germany. I think the implication is that the Weimar Republic rapidly devolved into Nazi Germany and the Roman Republic rapidly devolved into the Roman Empire. I'm sure I'm missing a few other good examples of authoritarian/totalitarian regimes arising surprisingly quickly from relatively liberal democracies. (In particular, I'm not familiar with how stable or liberal Italy, Spain, or Greece were before their mid-20th century dictatorships.) History has shown that liberal democracies are metastable forms of government, capable of self-correcting moderate pressures toward authoritarianism, but not immune to larger swings. I don't think the US is close to spiraling into authoritarianism within my lifetime or my children's lifetimes, but I would caution against rounding the tail risk to zero. Political change is glacially slow, except when it isn't.