“Demonstrators shouted slogans such as ‘black lives matter’”

BALDERDASH!

If black lives were not dirt cheap - - if black lives REALLY mattered to the blacks themselves - - two things not true now WOULD be true:

[1] young women would demand the fathers of their children marry them and remain faithful BEFORE the arrival of the children

[2] they would demand that Planned Parenthood  - - which deliberately locates its for profit abortion mills in high density black communities to kill as many black babies as possible - -  be de-funded and abolished.