I only have a limited time to throw in a reply here, but wanted to make a couple of points that I think are getting missed. I read through the National Review post, and found the data to be misleading and innacurate. I'd encourage you to take a look through https://mappingpoliceviolence.org who I believe have a much more thorough process for gathering and verifying their data. You'll see that around 1,000 people are killed by police in the US every year, of which about 25% were black (242 per year), compared to being ~13% of the population. 30% of them weren't armed. And these are just the national averages. Some jurisdictions actually perform way below that (good news!). But it gets very ugly very fast when you dive into other municipalites that pull the average up. In those cases, I don't know how you can attribute it to something other than racial bias. It's a life and death issue for the players protesting, which is why I think you see so many players standing up the critisicm even if it puts their careers in jeopardy.
The sad truth related to this entire effort is that we make it extremely difficult to learn about gun and police violence in the US, largely for political and ideological reasons.
The good news is that there are groups out there, led by people of color proposing real, comprehensive solutions to these very issues. I'd encourage you to check out Campaign Zero for more information: https://www.joincampaignzero.org