There are far more examples, or does the media just show more? We've seen before how white or black people killed in the recent riots haven't received almost any exposure. Could be a very similar situation.
How do you know these unarmed kills are all racially motivated? You don't.
So you can say the system is flawed, but you really can't say it's racist. Individuals are the ones that may be racist.
Which cops exactly that intentionally shot an unarmed person have been dismissed?