@AnarchoNinaWrites 2021 was after people voted for Biden over Trump; they were still locked down when they were voting. And the lockdowns meant a lot of people who often can't vote because of other issues (like juggling 1.5 fulltime jobs and other responsibilities, y'know, the kinds of things that might lead a person to think "I bet the Democratic platform would make my life better") couldn't go to work on that Tuesday, so they voted.
Believe me, I'd like to think genocide was a major issue that made voters stay home. But it's hard to suss out this number set (as well as the fact that more people voted for Trump in 2020 than in 2016) without thinking "It's probably the pandemic."
Harris pulled more votes than either Clinton or Biden did.