looking at the comments on s9's link and the comments on here it really looks as though you are in the minority spanner.
i doubt you would have the same opinions if you were a land owner and they broke into your land by smashing down fencing or breaking open locks to enter it.... and then continnued to make a huge mess some of which has to be done properly because of the health and safety issue concerning human excrement

and im quite sure you wouldnt like it if any of your elderly relatives or elderly friends had been taken in or intimidated by these people who come to your door .. it happens and it haas happened locally over the years. these people return year after year..doing the same things leaving a trail of mess, sh*t and costs which have to be met by someone, eiother landowners or councils. i dont think thats fair or right and so do a lot of other people. you only have to see that in the local papers. obviously they can come and park up in a lane or land near you and they would be welcomed with open arms by you and your family