Open this photo in gallery: Supporters of Alternative for Germany (AfD) party sing the national anthem during a protest against the government in Berlin in 2022.CHRISTIAN MANG/Reuters Sadiya Ansari is a Pakistani-Canadian journalist based in Berlin. The summer tradition of relaxing at an open-air public pool in Germany is sacred. Hardy swims, languid afternoons sprawled on wide lawns, and the option to zip to a well-stocked café for a beer: For a century, “Freibad” culture has been a staple of urban German life when the temperatures rise. So earlier this summer, when a series of brawls and assaults broke out...