You say Hitler's been done and gone suggesting that the passage of time matters, but slavery's been done and gone for over twice as long, and you are still counting that. Which way do you want to have it?

On the one hand you mention 1492, but your focus seems to be slavery...so...huh? The indigenous peoples of the Americas have a legitimate claim to have experienced genocide, but that's largely unrelated to slavery.

Then you seem to be equating slavery, which is ghastly, with annihilation, which is even worse. 2/3 of Jews in Europe were exterminated, and it would have been more but for the military action of the allies. Again, the same insensitive "seven years vs. 535" thing--are you even thinking about what you're saying? Seven years of awful vs. 535 of awful and then some? If you're counting the present day, what's the message? "You know, 10% disparity in callback rates for job applicants on the basis of their name, and doubled infant mortality (1% vs 0.5%) is equivalent to or worse than Auschwitz"?!?!

Responding to one historical horrible human tragedy (with significant though vastly lesser ongoing repercussions) by diminishing the significance of another horrible human tragedy is completely wrong-headed. Your take-home message seems to be that we should be insensitive to human suffering and death.

I can't tell whether you're incredibly antisemitic, or just incredibly insensitive to human suffering so long as its not a group you identify closely with, or if you're neither but it's all just words to you, not things that happened to real people.

Whichever way it is, I vehemently reject your approach. People matter.