Selecting JD Vance as the VP nominee is by far and away the absolute worst possible person to be a VP. A colossal dumpster fire. Outside of his brief 18-months as a US Senator, he has zero experience as an elected official. Not to mention all of his extreme right-wing views.
The good news is that JD Vance is so bad that it should beyond obvious to anyone who isn't part of the extreme right-wing cult that Kamala Harris is the right choice for VP.