The author seems to have entirely missed the point that some immigrants resist integration, at least psychologically. A 2016 study, for instance, indicated that 61% of Canadian Muslims identified primarily as being Muslim rather than Canadian and a recent NY Times article, written by a Muslim, points out that Muslims sometimes reject Western values, creating a barrier to integration. He notes that "Often Muslims support liberalism when it serves them and reject it when it does not." My own immigrant mother, albeit a Christian Caucasian, said it took her about 20 years to feel like she was a Canadian, at which point she acquired Canadian citizenship. But she always encouraged us, her children, to embrace our Canadianness above any other identity. Integration is in fact a two-way street that requires give and take on the part of both immigrants and their host society. 

https://www.nytimes.com/2017/03/27/opinion/is-free-speech-good-for-muslims.html?mcubz=1&_r=0