If the U.S. is so bad, why not invite the leftists to leave. The cost of offering one-way plane tickets would be a pittance compared to the benefits of having leftists out of the country. From Brandon Smith at alt-market.us:

At what point does radical activism cross the line and become a declaration of war? It’s a question I’ve been pondering for a long time, as well as the implications it has for the concept of “democracy.” How much should civilization and heritage bend to the desires of contrary groups in the name of freedom? If a movement has consistently proven itself to be a destructive force that seeks to undermine the foundations of the west, should they be allowed to stay in the west? Is it authoritarian to kick them out? If it is, does it matter?
If these activists hate western culture so much, why would they want to stay in places like the US? Why not leave of their own accord to a nation or society that fits their philosophical demands? The only logical conclusion is that they stay because they want to sabotage the US and force everyone else to submit to their political vision. The truth is, leftists are ideological colonizers pretending to be “victims” of colonization.
Last year I published an article titled ‘A Study Of Cultism Shows Us Why Gatekeeping Against Leftists Is A Good Thing.’ The core of my argument was rooted in a historic example of far-left extremism and moral relativism allowed to run amok in a rural community in Oregon, and how state and federal governments eventually had to deal with the threat.
In 1981, the small town of Antelope, Oregon was chosen by the Rajneesh cult led by a man who would later call himself “Osho” as the future capital of his movement. After being run out of India by numerous investigation, the cult sought out a place where they could infiltrate and establish without much opposition. The Rajneesh would visit the town in limited numbers, buy up land, and then thousands arrived suddenly in waves.