Just listen to them about their general complaints about capitalism and then show them the actually existing benefits that socialism can bring them. Radicalization doesn't come from arguments about Stalin, it comes from just showing them that their complaints and frustrations are valid and are an issue with their economic system, and that a superior alternative has, indeed existed. A great communist is a great listener, of course.
Just listen to them about their general complaints about capitalism and then show them the actually existing benefits that socialism can bring them. Radicalization doesn't come from arguments about Stalin, it comes from just showing them that their complaints and frustrations are valid and are an issue with their economic system, and that a superior alternative has, indeed existed. A great communist is a great listener, of course.