The notion that Harris & Trump were somehow equally unqualified or noxious candidates is one of the biggest lies Trumpers tell themselves (and the same goes with Hillary). By nearly every objective, real-world metric Harris was vastly more qualified than Donald Freaking Trump to be POTUS. Of course she wasn't perfect (who is?) but Trump is so much worse by nearly every standard that it is a joke to argue otherwise.
If Harris had been elected none of the shit we're going through right now would be happening, period. Trumpers can claim whatever the hell they want regarding their vote, but she lost because first, she's a woman of color, second, she's from California, a state Trumpers love to hate, and third, she was a vice-president in an unpopular administration. Things like inflation were nothing more than an excuse for them to do what they were already going to do. The fact that her opponent had a failed first-term presidency, that nearly every leading member of his first administration openly said he wasn't qualified or possessed the character and temperament to be president again, that he openly said he would raise tariffs and spent most of his campaign rambling incoherently like a drooling fool at rallies didn't matter a whit to his adoring cult supporters, because the Donald Trump they believe they support doesn't exist and never has.
All they knew - based on Dear Leader's insults and Fox News and other right-wing media (including much of legacy media), and word of mouth they likely heard at their church - was that Kamala Harris was a feminist woman of color from that liberal hellhole of California who slept her way to the top and had a weird first name and supported kids changing their gender like that Trump TV commercial they saw and she symbolized all of those snooty overeducated blue-state snobs who look down on people like them. And, conversely, that Dear Leader really cared about people like them (lol) and he wouldn't do anything too stupid if he got elected and he surely wouldn't do anything that would hurt them personally. And so here we are.