Those pictures are amazing. All it needed was a old couch and a junkyard dog to complete the picture. People are lazy, that is the bottom line, they do not want to have to haul all of that stuff down everyday. Lazy, Lazy, Lazy.
In regards to having the beach cleaned up every night or morning. What about people who have gotten in trouble with the law. They could do community service by cleaning up the beach.
I'm not sure that I want prisoners, or people in trouble with the law, getting involved with removing items from the beach. I can see more trouble starting from the chair or tent owner getting heated with someone who doesn't need to get into more trouble.
Regarding laziness. I agree that some of it is attributed to laziness, but I think it is more due to people's unwillingness to change and their comfort. I've seen some people drive their trucks onto the beach to collect only their cooler and people, then leave all of the chairs, tents, crab nets, casting nets, waterguns, etc all in a big pile under the tent frame. These people actually have an easy means to pack it up and remove and replace it daily, but don't do it. Maybe you are right about them being lazy, but I believe there is something else happening in their minds. If these particular people are lazy, I would chunck them into the pile of "Extremely Lazy," not your average couch potato.