I actually think Biden chose her for a reason and I am sure there were a lot of conversations, the only logical reason is she can be sacrificed with no damage to the party, because most everyone hates her. Biden and his puppet masters know he is going to lose, Harris is meaningless in the big picture.
Unless Biden somehow wins and is immediately "gotten rid ot" ....
Or Biden is dumb as a sack of rocks. He’d backed himself into a rhetorical corner by stating he was going to choose a black woman. If he broke that promise even CNN would know he’s toast.