Did you mean to say he killed 500K white men to free niggers?

Wars are always happening and men are always dying in them. Over 600,000 men died in the Crimean war a decade before the US civil war. Almost all of them were white. And it was fought for a silly reason like maintaining anglo-French prestige that would be ruined if the armies turned back without actually fighting.

At least the civil war ended slavery and prevented further negro proliferation. It had a net benefit unlike the Crimean war or a dozen other wars fought in the 18th century like the wars of the Spanish and Austrian successions.