"What am I supposed to do?" that says it all really, they just don't know how to deal with the issue & don't understand the consequences. Sure there wil be diehard "Don't give a stuff" people, just like the aggressive & negative ones on here, but in exactly the same way, they are in the minority.
We have an obligation to help educate the ignorant, even if there were only a handful that change, it is a change for the better. I simply cannot stand the attitude that "I know better, so everyone else should," it clearly isn't true & cannot change things.
Soon after getting the van, I bought a spare cassette to accommodate Mrs Smaug's needs as she is no longer as capable of holding her breath so long as she used to (after 2 kids & half a century). Best thing we ever did, I just swop the cassettes over & we are immediately back in business, so to speak, and have a few days to find a safe poo disposal place. But newbies are always going to get caught out, even if they overnight on sites with facilities, the cassette will fill up between sites & people expect to just be able to keep using it. Bursting for the loo & none nearby, they are "forced" into stupid disposal tactics by their own lack of foresight.
All they need is the simple advice to keep an eye on the levels & empty it before they get stuck somewhere inappropriate with a full bladder & a full cassette. Why is that so offensive to the handful of loudmouth protesters on here? If we can reduce the number of theses incidents we all benefit.
Incidentally, has any one ever seen such a dumping incident off season? If I am right about it mostly being ignorant newbie hirers then it will be rare for them to be touring out of season. If we could get a registration number & maybe confront a hire company with a photo, I'll bet they would make an effort to instruct their hirers in future!