Trump reminds us of what the US is - a deeply sexist and racist society built on genocide and slavery. It's who we are and have been. But recall that less than 20 yrs ago, Obama was elected on the promise of what the US could become. Sadly he then chose capital over the American people with the bank bailouts, he dropped drones overseas, etc. We became very disillusioned.
Crucially since then, the Democratic Party machine has only denied that disillusionment rather than address it head on.