It's especially distasteful when it's about people who 'discovered' places, because the next step was usually the subjugation or genocide of the people already living in the discovered place. But we still celebrate the explorers as heroes.
If it were someone else, I’m certain we’d be talking about them instead.
also people often treat it as the beloved kind of "small person who know better even through everyone told them they where wrong and succeeded by not giving up" story
but the funny thing is the more you learn about him the more you might realize how wrong all of this is
firstly he hadn't had success because he knew better (and people didn't believe him) he had success because he insisted that his absurdly wrong calculations where correct and then had a absurd amount of luck. (In educated circles of that time not only was it well know that earth was a globe, it rough size was also known. The reason he believed he could sail to India was because he insisted that earth was _way_ smaller then it actual is (and also was believed to be in general back then). It's just people (including him!) through there was no additional landmass between the west of Portugal and ~east India. Consider sailing that route on a world where America is just more water... pretty much not viable with the tech of that time).
Secondly if anything he was a villain, to a point even the Spanish Inquisition called him out for his bad behavior against native Americans...
So I agree, no reason to give him any more attention then any of the many other half assed villains which lucked out in human history.
And it had been known for 1600 years already!
"In 1500, during his third voyage to the Americas, Columbus was arrested and dismissed from his posts. He and his sons, Diego and Fernando, then conducted a lengthy series of court cases against the Castilian crown, known as the pleitos colombinos, alleging that the Crown had illegally reneged on its contractual obligations to Columbus and his heirs.[93] The Columbus family had some success in their first litigation, as a judgment of 1511 confirmed Diego's position as viceroy but reduced his powers. Diego resumed litigation in 1512, which lasted until 1536, and further disputes initiated by heirs continued until 1790." -https://en.wikipedia.org/wiki/Christopher_Columbus
280 years of legal battle is going to be a treasure trove of dirt, if you want to find it.
As for "why now" and "why does it matter what his heritage is" I think it has everything to do with the cultural milieu. Modern white liberals hate their heritage which they characterize as ancestors of colonizers, slave owners, and exploiters. If Columbus was Jewish this gives left-wing anti-Semites extra ammunition against Jews. It aligns the deep hatred for colonizers with deep hatred for Israel for its actions in it's war with Hamas.
Historians like to say the past is a different country. Judging historical events by todays standards makes about as much sense to me as discovering life on Mars and judging their behaviour by our own standards. For me, its just a way of signalling virtue that assigns zero cost on the signaller. It's historical so you dont have to do anything (it doesnt cost you time or money) and the people being judged arent here to defend themselves or provide any nuance. Its lazy and cheap.
You will also find that a lot of people had their reservations about his treatment of the people he found.
I mean that version of the story is pretty interesting too, right?
One can see a lot of parallels between startup culture, really. You start off with a dumb idea, you pitch it over and over for years till you find a sucker, you get funding because of nepotism / connections, your dumb idea fails but you stumble across something that works on the way, then you move fast and break things (like... the entire indigenous population).