We are going round in circles, the idea of a distinct national culture is itself a false construct. In modern society there are no culturally isolated groups, different cultures (of which there are many types) overlap, and many are not limited by geography. As it has already been argued, the influences of local music, cuisine, etc do not stop dead at national boundaries.

'Do you at least agree that because some phenomenom has occured for a long time it does not necessarily mean that it should definitely go on?' No, but in the case of immigration yes. Would all the Eastern Europeans come and work in the UK if there werent any jobs? Why is there unemployment among the 'native' population whilst immigrants still manage to find work? Its too easy to blame the foreigners for all the problems in the UK, where in fact many of the problems are home grown.