The adults and the populists

You seem unable to have a philosophical discussion without attributing those philosophies to others. You need to redefine Libertarian. It follows that people have a degree of freedom to act as they wish in their own interests. That action should only be limited by law and herein lies the crunch. A libertarian law system would be at best soft touch, but nowadays it is not, it is becoming more and more draconian in its measures. Not only are you not allowed to do things but there are now things you have to do as mandated by law, and that is not Libertarian. I am banned from using race( as legally defined) as a deciding factor in any decision I make but in law some people are mandated to consider race as a factor in to whom to offer training and or employment. The inconsistency in this as a moral outlook is plain to see.  Saying you have no knowledge of those laws does not remove their existence, of which has been referenced many times.
Having different cultures in one's country is not a problem, having different cultures in one's country in an unbalanced and potentially dangerous way is at best idiotic and at worst criminal if deliberately sought. The imbalance was achieved many years ago as the Rushdie affair highlighted and the race riots, sometimes devoid of white faces, further exposed. It is only becoming worse as teh latest round of unrest shows.