cherries and apples thank you for posting - I do agree that education and having a choice is a good thing. I am not sure what the answer is, but if we could find a place for Travellers in our culture and by perhaps setting aside legal stopping places or more sites then there wouldn't be a more them and us attitude and education would be more possible and more of an option.
Fifi on settled sites - assuming you mean local authority run sites - there are no complaints from the general public. They live on these sites like any other person who lives in a house - they have a trailer for general living and a brick wash house / toilet facilities.
Re the poo questions: Travellers would not bag up their poo like humans do with dog poo. Firstly they are not dogs but people so to liken them to animals would be seen as very offensive and b. Where would they put the poo? It's not as if a large encampment would all put human faeces in overflowing dog bins even if you got over the factor of likening them to dogs plus this would be very hazardous for waste collectors to dispose of because of human to human transmissible germs.
Likewise it's not really practicable to carry round a spade and dig a hole when you have many children running around and little time because you don't want to be caught by anyone pants down having a poo. Speed is of the essence.
If there were toilets, Travellers would use them. It is unfortunate that there are so few legal places to stop with facilities which mean when Travellers stop illegally there are no flushing loos.
It is unpleasant but the most sanitary and cheapest way for councils to deal with human waste is to simply leave it if it is spread thinly and not in large concentrations to degrade naturally over a week or so. If there is a larger toilet area with higher concentrations it is sprayed with disinfectant and left.
And...if people would rather have toilets provided on an unathorised encampment - that is a very expensive option - couple of thousand pounds would not be unusual - local authorities do not have the money