Again, if you pick players with a view to the test matches, as you should, Sexton is out and out a better choice, because he has played Test rugby before, has been highly successful at every level, has played and won against South Africa before and achieved everything a 10 can achieve in the game outside of a World Cup. Which player would you rather have in a Test against SA, because that's literally the only argument that has merit for me. Picking a young guy because he will play a game like Russell in the dirt trackers? Who cares? Surely bringing in a player that more resembles your likely test starters has more merit anyway as that's how we will look to play in meaningful fixtures.
I don't know why you keep bringing up Xenophobia, its been clarified several times we don't think he hates Irish people. We think he has an extremely contentious and well documented relationship with the IRFU on the back of being (unfairly imo) fired, which colors his view on Irish rugby as a whole and his selection of Irish players. I also think its personal for him and Sexton.