Gabriella You say "another minority "untouchable" group". What other minority groups do you claim are "untouchable"? Do you hae a list, or perhaps you're not prepared to divulge it?
You also refer to "a curse and blight on the face of the earth" . That sort of language is very reminiscent of the language used to whip up hatred of various groups of people throughout history and to justify their ill treatment, incarceration or worse.
I thought extortion, threatening behaviour and fly tipping were crimes and, as such, should be dealt with by the relevant authorities. Of course the "political correctness gone mad" pronouncement is often made in cases of this nature but it seems to me that many people are far from "politically correct" and feel quite free to call all travellers "pikeys" "gypos", etc, etc.
If there is strong pictorial and other evidence of people commiting extortion, threatening violence and commiting environmental crimes, etc, etc, then the legal authorities should have no problem in justifying a prosecution and countering a claim of discrimination.