I feel like your ‘blue lives matter only if they’re black’ tag misses the point of the post. No one is suggesting that the death of a cop isn’t tragic (it’s right there in the tweet when he says ‘rightly upset’), he’s pointing out that the deaths of black people killed by police are just as tragic, far more frequent, and the people responsible are not being brought to justice while large portions of the general public rally to their defense. No one is trying to excuse or defend cop killers