Aristotle coined the term "enthymeme" to refer to arguments, words and ideas that are broadly accepted among the people of a nation. So what happens when enthymemes start to disappear?
Efforts to kick extremists off the internet can't succeed and might even have the unintended side effect of bolstering support for radical groups.
Two websites, one taken offline, the other still active, raise hard questions about how prepared Americans are to deal with free speech about white supremacy, in both monuments and domain names.
Barack Obama may have chosen Mandela's words for his tweet precisely because they offered some distance from the political space in the US.
The right-wing extremist group La Meute recently held a rally in Québec City that put Canadian racism in the spotlight. Is Donald Trump emboldening hate groups in Canada?