In this instance, no doubt they chose the color red to signify blood - as in slavery. That's one of progressives' favorite cards to play.
No matter that much of their claims rely on fake history. They would have you believe that abolitionism only began in the 1820's or so with Garrison, when in reality abolitionism far pre-dates the U.S. itself.
Anti-slavery in America from the Introduction of African Slaves to the Prohibition of the Slave Trade (1619-1808)
https://librivox.org/anti-slavery-in-america-1619-1808-by-mary-s-locke/
An Historical Research Respecting the Opinions of the Founders of the Republic on Negroes as Slaves, as Citizens, and as Soldiers
Those who historical slavery are the most adamant then men should be enslaved for their benefit.
The BIG question is why did the government police that were present allow this to happen? What filthy vermin.
Life sentence for terrorism against the US with no early release. Alternative, death.
If the report concluded the guilty individuals were terminated on the spot and deposited at the local landfill, things like this wouldn’t happen.
In other news, Chuck Schumer and Mitch McConnell were seen outside the National Archives selling bottles of a red substance...