The most significant thing the left has is a major news media, stacked full of leftists, who have the Revolutionary agenda in place and they definitely practice, “the end justifies the means," method. Good people who know that the real goal of the left is annihilation of those who disagree with them, even in the tiniest matter, are horrified at the lies that are passed for truth by the media and by the endorsement of everything politicians of the left say or do. When I see the arrogance of these people, I wonder if Cocaine or some other mild altering substance is being liberally used on a regular basis. No one in their right mind would willingly, with gusto, try to decimate their nation like these people have. In reality, looking back at history, those who started Revolutions didn't fare so well in the end. Oh, they changed things alright, but most of them did not get to enjoy the spoils for very long.
It's the mind altering drug of indoctrination - the teaching by progressives (and those taught by progressives in "Schools of Education") that America is evil and that our Constitution has hurt the rest of the world (people, planet) -- the constant drumbeat coming from progressive elites working in tandem to discredit and eventually destroy freedom and liberty that flows from capitalism, and God and protected by the 2nd Amendment.
As mentioned above, if you convince enough people (free them up and give them permission to be violent) to act on your behave by telling them they're victims of the productive members of society, you can tear down a country.