The #1 job of a VP is to be a deterrent to taking out the POTUS. This is the reason Agnew was Nixon’s VP, as Agnew truly frightened the left. So they had to take him out first before even considering impeachment.
It also works internationally. So does the idea of
J. D. Vance as POTUS scare the ruthless tin pot dictators around the world? How about Democrats and the media? If he does that he is a good choice.