I would tend to say that we in Britain are not doing nearly enough things like this to defend our way of life.
If more people did stand up, and be counted in support of Britishness, maybe we, as a country, would not be seen as such a soft touch.
I agree entirely that whoever, moves to a new and different culture, should immediately forgo all connections to their old culture and fully embrace the new one, language, dress style, education, everything, even to the point of changing your religion if the main one in the country you are going to is different to yours.
If you do not want to do any this then, quite simply, don't move, or move to a country that has the same beliefs and culture etc as the one you are moving from.