https://www.history.com/topics/gay-rights/the-stonewall-riot...
https://en.wikipedia.org/wiki/Stonewall_riots
The 1970s generally were rather more violent than is commonly remembered:
https://time.com/4501670/bombings-of-america-burrough/
Going further back, there's the history of police (and military) response to labour organisation, the reason many larger US cities have military armouries:
The proliferation of urban armories—dedicated buildings for National Guard unit training and community functions—dates to the 19th century, according to Army National Guard Lt. Col. Don McFadden, chief of the Strategic Plans and Education Branch. “The Civil War draft riots and labor riots of the 19th century spurred construction,” he says
https://savingplaces.org/stories/a-salute-to-us-armories
As Jeremy Brecher wrote in his labor history Strike! state governments built armories as fortresses in American cities “not against invasion from abroad but against popular revolt at home.”
https://shoeleatherhistoryproject.com/2020/03/12/storm-cente...
A common element to many is protest not simply of some policy or political issue, but where the aggrieved group is seen by The System as non-persons, and the protest is aimed at the system itself. Most especially at how The System exerts its will, which is to say, through police forces, courts, and corrections. When the institutions of law and order themselves are questioned, common ground is thin, and dialogue gives way to protest, suppression, and violence.
The wave of George Floyd protests in 2020 is a continuation of the Black Lives Matter movement in 2013, itself evolving from the Civil Rights movement of the 1950s, 60s, and 70s, with its own history of violent outbursts in every decade since, many provoked by police brutality against minorities.
The principle distinguishing characteristic of the current protests in Portland, Seattle, New York, Chicago, and elsewhere is that the movement has general support well outside specific oppressed populations.
[0]: Which include over $500m in damages: https://www.mprnews.org/story/2020/07/11/federal-government-..., and that is just in one state. So the total is likely billions across the entire US.
There are 35 incidents listed from 2010--2020, inclusive. Another 25 dating to 1990, which for some of us is still recent history. Damages for numerous events (in 2020 dollars) is in at least the $1s to $10s of millions of dollars range.
Even the quiescent 1980s sees 8 entries, down from 35 in the 1970s and over 65 listed for the 1960s, suggesting relatively little presentism bias.
Going back further, one finds the behaviour throughout US history, though with some decades standing out especially. The 1860s & 1870s, 1910s & 1920s (often white-on-black violence, including but scarcely limited to the Tulsa Race Massacre of 1921, but also other immigrant and anti-union violence).
The majority of the events from the 20th century onwards, but especially since 1990, are tied either to racial protest or incidents of police brutality or killing, Numerous others to white-nationalist or similar majority-induced violence.
Sufficiently aware?
> What other protests have anywhere near this much violence?
The recent protests/riots have caused at least $500m dollars in damage per Minnesota's own claims. And substantially more if you include everything across the nation. There have also been at least 15 deaths as a result of the riots.
So I pose the question again, what other recent protests have caused anywhere near this amount of violence? From what you have provided, none. Almost no deaths and about a 100th of the property damages. Nothing you provided comes close.