Maybe some of your theories are true but look at the whole picture.
Some of the most succesful business here are created by people who come from outside Europe opportunities remain for all The Chinese and Indians that came to the UK with nothing are now very wealthy because they do good business....If Bulgarians feel like they are treated as meat its because they allow themselves to be treated so...Like it or not Europe is expanding if you feel like you are getting a raw deal then its up to your politicians to get you a better one.You cant blame ordinary people its the governments who create the changes.