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Integration and harmony can hardly be considered destructive.
Integration isn't the problem, the problem is immigration with a lack of integration and the tension caused by this. This shouldn't be a problem, but in reality we have a tiny vocal minorities claiming parts of the country to belong to their culture, which we largely ignore, and thus the problem seems to be growing, at least from a media perspective.
We don't seem to have the problem in Scotland, but I'm fairly sure it exists in parts of the country south of the border and we should probably attempt to control the situation before we end up electing some racists nutter party to run the country.