... go out to every decent US American.
This is a catastrophe for any enlightened/progressive cause, but one that I hope will be kept in check by many of your hopefully shared values as well as the inherent safety mechanisms of your democracy. I don't know if I'm being overly optimistic here, but I hope I am not.
The most worrying thing of this incident, to me, is how much it will bolster the rise of this uncivilized, brutal, big strong guy I-don't-give-a-fuck way of politics around the globe, especially in Europe - a place where right-wing lust for ethnicity-based regression is on an all-time high and will meet less of a consensus that democracy, after all, is a Good Thing. Much of global politics will depend on Europe, and how much its states will be able to resist their drift toward nationalist narrow-mindedness and reactionary barbarization.
Truly ugly times. My condolences.
Reading: Freud - The Interpretation of Dreams