Colombus didn't discover America!

It was the Native Americans who discovered European racism, slavery and brutal wars of conquest...

And... what exactly is your point, OP?

Anyone with a high school education knows the Columbus story is typical bullshit folklore. Get over it.

And nothing of value was lost!
Wrong. We lost one thing of value: cultural diversity. I'm not saying the "native" American cultures were valuable. They weren't. Neither were the actual lives of the people. It is the diversity itself that was valuable. More diversity makes for a more tolerant and level-headed society as a whole.