This explains it pretty well, not just regarding specific current causes, but the actions of the past as well:
The Left’s Premature Revolution
Here is a snip from the article, and it just gets better from there:
There an evergreen adage in the world of business, politics and entertainment: “Timing is Everything.” It’s a truism that is lost on the now fully radicalized American left and their militant cohorts in their mad dash to exploit the tragic death of George Floyd.
During the Obama presidency, the death of Michael Brown and the subsequent acquittal of Officer Darren Wilson in Ferguson, Missouri, as well as the death of Freddie Gray in police custody in Baltimore, engendered riots, looting and violence in those cities. These events demonstrated to the left that the Marxian tactic of exploiting class animosity to foment revolution, which has not succeeded in an essentially egalitarian United States, should be replaced by the fomenting of racial animosity and the exploitation of egregious law enforcement events, which could be the catalyst to launch the fundamental transformation of the nation. These occurrences can trigger, not just local, but national upheaval that can be used to browbeat the citizenry. Particularly as their militant wing greatly expanded with the creation of the organization, Black Lives Matter, after the Ferguson riots.
Taking a page from many 20th Century despots, Black Lives Matter utilized the facade of branding their militant Marxist entity with a sentiment few would take issue with, as black lives do matter. Hence, they were able to intimidate major corporations into making massive financial contributions and engendering positive media coverage while advocating Marxist ideology and Fascist tactics alongside their fellow travelers in Antifa.
The core of the article is in the five points it presents.