I can think of one reason, he doesn't want to end up like Seth Rich. Barr did what was necessary to get us where we are today. Black hats will look back and see he was instrumental in their takedown, places a big target on his back. He is most likely out of the political game, not returning, he needs to take the heat off himself and his family. At this point it makes no difference what he says, it changes nothing, the election fraud evidence has already been collected and it will seal the fate of many. Barr is simply trying to exit stage left and remain alive.