Using Topic Modelling and Sentiment Analysis to find common ground between people of differing opinions

My latest video is about the Common Ground Algorithm, an idea I've had to try to address the problem of filter buo bbles on line. Given two people with differing opinions, can we use NLP to find common ground between them, and thus encourage civil discussion between people who might otherwise distrust each other? As usual, you can explore the code in this Kaggle kernel.