Your comment is a good example of the us vs. them mindset they are talking about in the article.
First author Lukas Reinhardt (Leader of the Global Cohesion Lab at the Centre for the Study of Social Cohesion [CSSC], University of Oxford) said, “Us-vs-them thinking is on the rise in many places all over the world, exacerbating conflicts and complicating finding solutions for pressing global problems.”