If BLM was more than just a political party seeking to exploit black people, I think they would be focusing more on the #1 killer of black people(gang violence) rather than freak accidents that happen with police.
A freak accident is your cell phone exploding. The systemic injustice that people of color face at the hands of police is neither uncommon, nor accidental.
The word "uncommon" is very subjective here. According to this article: https://www.wsj.com/articles/the-myth-of-systemic-police-rac... police shot 9 unarmed black people in 2019. 9 deaths out of 375 million annual civilian contacts is fairly uncommon in my opinion.
Back before shows like Live PD and COPS were taken off the air earlier this year - watching them made very clear people in marginalized communities could expect more frequent and less courteous interactions with police. People were frequently followed and pulled over for things I would never be stopped for.
After the stop its made clear the officer wants an opportunity to search, not to merely talk about whatever traffic infraction was the pretext. Another scenario I never experience.