Your doing it again. I don't want moorings available wherever etc. That's what some members of NBTA appear to want. That's what is being discussed.
About your privilege; If you have worked hard & achieved at least some of your desires, it can be easy to forget that some have worked equally as hard, yet not achieved, possibly through no fault of their own.
You ask why "that simple truth" should be any different for a boat dweller. I don't think it is or should be. I don't imagine that living aboard gives people any more entitlement about location. But just as I don't imagine there are any NBTA members lobbying Dorset County Council, I don't suppose there are that many members of the National Bedsit-Dwellers Assoc lobbying CRT about providing accommodation for it's members.
If you only want to come up with reasons as to why something shouldn't be done, rather than put your mind to how things could be done, that's up to you.