This is what happens after 8 years of hyperbolic and hysterical rhetoric from the Democrats. Not "The Left" but The Democrats since they are one in the same.
Dave Rubin made this point a few weeks ago- the current path we're on in this country is unsustainable. There is an energy and momentum that is propelling us towards some sort of watershed moment.
Just go on the politics subreddit and read the redditors posting about how the shooter was "2 inches from saving democracy." When you have people that believe the best way to save democracy is to circumvent it and kill the leading candidate from the party you don't like, your nation is in trouble.
Chuck Schumer, Van Jones, James Carville, Joy Reid etc. all own part of this.