This isn't just a race issue, how many historical figures in general can people name?
I'd gamble that 7% of British people think Winston Churchill signed the Magna Carta at the end of the first world war, and I include former prime ministers in that.
Or to add to this, Scotty knows a request to travel from the bridge to sickbay is going to take priority in an alert situation so travelled via the bridge to skip the queue.
The massacres have been occuring through all of human history, the world does not see any years without wars and atrocities.
The question I'd ask people is how they suddenly notice when this is happening.
If you're struggling to ignore it and carry on with your life, think back to the point where you were blissfully ignorant of the suffering in the world and return to that state.
If he was hoping for 18,000 then 6,000 is not less than half of what he hoped for. It is exactly half of what he had for.