There is no such thing as an "alt-left" movement.

The terms "alt-right" and "alternative right" first came into widespread use during last year's U.S. Presidential campaign, and most people know very little about where they came from, but it you remember nothing else about these terms, remember that they are not generic; "alt-right" is neither a media invention, nor an academic label. "Alt-right" is not some label that people outside the movement have coined to describe them; it is a term that white supremacists invented themselves, to describe themselves, as a safely euphemistic alternative to being called white supremacists. 

From Wikipedia:

White supremacist^[6] Richard Spencer coined the term in 2010 in reference to a movement centred on white nationalism, and has been accused by some media publications of doing so to excuse overt racism, white supremacism, and neo-Nazism.

Excusing overt racism is exactly what Spencer was doing, by the way. "Alt-right" pure branding, a PR exercise by white supremacists to hide the worst of their ugliness from public view, allowing Republican politicians to pander to them in stump speeches, and at campaign rallies, and in their legislative agenda. It is a convenient fiction, a fig leaf that has no left-leaning or progressive equivalent. There is no moral equivalent to neo-Nazism on the left. There is no practical equivalent to the "alt-right" on the centre/left of the political spectrum.

So when Donald Trump spoke today about how the "alt-left" was (somehow) also to blame for last week-end's lethal violence in C'Ville, he was talking right out of his asshole, and spewing nothing but shit.

From CBC News:

A combative U.S. President Donald Trump insisted Tuesday "there is blame on both sides" for the deadly violence last weekend in Charlottesville, Va., appearing to once again equate the actions of white nationalist groups and those protesting them.

The president's comments effectively wiped away the more conventional statement he delivered at the White House one day earlier when he branded members of the KKK, neo-Nazis and white supremacists who take part in violence as "criminals and thugs."

Trump's advisers had hoped those remarks might quell a crush of criticism from both Republicans and Democrats. But the president's retorts Tuesday suggested he had been a reluctant participant in that cleanup effort. 

Donald Trump is a morally bankrupt, intellectually impoverished, egomaniacal, pathological liar. If nothing he ever did before now served to convince you that he does not deserve to occupy the Oval Office, this should. Last November, when America's racists all supported Trump's presidential campaign at the polls, it could still be said that not everyone who voted for Trump was a racist. That is no longer true. Anyone still supporting Trump today, after this performance, is a racist. Period.

Continuing to support Trump is a racist act. The same applies for his presidency, or his businesses, or his reality TV career, or his family, or anything else that he touches. To stand with Trump is to stand with America's neo-Nazis. There is no morally equivalent opposing movement that you can point to and say, "they're just as bad." We're talking about literal Nazis; nobody else is as bad.