And I'm sure there's hard data that shows your assertion is valid, and that it's not just a general feeling you have that it's true?

Incidentally, as a general truth, major changes in institutional policy regarding race (or bigotry issues in general) have only come with disruption. The civil rights era of MLK was not just a bunch of people protesting quietly on a sidewalk, the abolition of slavery came with a war. So the idea that you seem to be presenting is based on some incorrect pretenses regarding being nondisruptive.

But in any case, my point wasn't "We should be actively seeking to disrupt traffic", but "Disruption to a commute due to a protest of yet another homicidal attack from police is absolutely acceptable, and trying to frame things as 'Don't do anything disruptive as a show of honor to this young man' is disgusting and self serving."