People are judgmental because mass migration from high-crime countries transformed Sweden from one of the world's safest countries to having the highest rate of gun violence in the EU, and Sweden has been increasingly transparent about the situation.
Because of the political climate in most Western countries today, we can't have a rational discussion about negative effects of mass migration, or consider scenarios where the negative impact might outweigh the benefits. It's just a conversation we can't have without shallow knee-jerk accusations of racism and fascism and Nazism and so on.