" there have been other, worse slaughters during and after WWII. We don't hear about them."
Stalin killing millions of russians who opposed him? No I never heard about it. I also never heard about Mao's cultural revolution. Never heard about Pol Pot's killing fields. Never heard about Rawanda. Never heard about Darfur.
You're right, the holocast is the only genocide I've ever heard about.
