It’s also that Campbell used his op-ed space in Astounding to cheer the murders of the Kent State 4. He attributed the Watts uprising to Black people’s latent desire to return to slavery. These were not artefacts of a less-englightened era. By the standards of his day, Campbell was a font of terrible ideas, from his early support of fringe religion and psychic phenomena to his views on women and racialized people.
To your other point, there are awards named after arguably worse people who did arguably worse things. That’s an argument against those people, not an argument that Campbell’s cheerleading of genocide should be considered less of a big deal.