What do you think is the reason for the cultural isolation of Irish travellers and Romany gypsies?

One possibility could be that they consider themselves to be 'not part' of the people they travel among and keep their own council which attitude will invariably alienate them from the most part of their fellow man.Travellers have been distrusted ever since man first began to settle as they were once a serious threat to life and foodstocks and in many places around the world bands of wanderers still are a great danger to settlements and travelling individuals.As people who live in settled communities shun the travellers so the travelling folk keep their own beliefs and culture wrapped around tightly,a form of uniform and badge.What do you think is the reason for the cultural isolation of Irish travellers and Romany gypsies?
They are very private people and that's the way they like it. Because of that people that don't know or understand mistrust them and make up horrible stories about them. The real Irish Travellers and Romany Gypsies are very honest and clean its the New age travellers and the like that give them a bad nameWhat do you think is the reason for the cultural isolation of Irish travellers and Romany gypsies?
My mom is Romani. Honestly, people discriminate against us. We don't know why. We haven't done anything to deserve being treated the way we do. We get denied citizenship, rights of the countries we live in and mention you are a gypsy, you're branded for life. It'd be like walking around screaming ';I'm a Jew!'; to German soldiers during the Holocaust. We don't want to deal with outsiders because of the Europeans, whom we've lived around for over a thousand years, have a problem with us. We don't want to deal with the problem of being denied basic human rights over and over so we keep to ourselves. My dad is Greek and I'm the only ';half-Romani'; in a family of over 200 and I've never met another half Romani and that's saying something. My Greek family, they can't stand me. I don't know why. I'm not a barbarian. For example, an estimated number of no less than 200,000 Romani people were killed during the Holocaust (some estimate as high as 800,000) by the Germans but Holocaust memorial groups won't recognize us or give us any recognition for what our people went through. We just don't count, it seems. It's not so much that we want to be isolated. It's just that we have to. Romani people get killed for being Romani everyday and no one investigates or gets charged in the murders because deep down, the cops, the judges and the majority population in general think ';good riddance.'; They just had an Anti-Romani march in Czech Republic a few months ago.
Because they want it that way..they have been taught over the years to stay amongst themselves as much as possible so the habit 'sticks' /gets passed down