The tipping point for someone like this is literally just the fact that they do not hate the rich nor blame the rich for anything nor see the rich as actively and knowingly causing everything that is occurring.
He gets everything else. He just doesn't get that you can't work with the rich for common ground. Once that is established in his mind you have achieved everything you need for them to radicalise leftwards.
The tipping point for someone like this is literally just the fact that they do not hate the rich nor blame the rich for anything nor see the rich as actively and knowingly causing everything that is occurring.
He gets everything else. He just doesn't get that you can't work with the rich for common ground. Once that is established in his mind you have achieved everything you need for them to radicalise leftwards.