This author writes without any first-hand knowledge.  The fact is that the Dutch and other Europeans, initially welcomed new people - but they have been abused by the minority of moslem fanatics that nevertheless control the mosques.  Gang rapes of white girls because they are 'infidels' and therefore considered 'prostitutes' are prevalent all over Europe.  In Toronto, they shut down a store because it showed 'art' in the window of 'their neighbourhood'. (Images are not allowed, by the Koran.)  Its a culture that despises the 'infidel', and is a throw-back to medieval dark ages.      
That's the reality on the ground, regretfully.  Not some goody-goody, we all love each other, wish, hope and dream, unfortunately.