It seems Eric L. from Redondo Beach needs to stick to a campground more his level.
Perhaps the KOA - Beverly Hills is more to your liking? I'm sure they will even heat up your Toilet seat before using it if his Majesty so pleases?
I've camped there more than a few times over the past 10 years and not once have I seen Diapers on the ground NOR Dog-poop-land-mines scattered around as he suggested.
Sure... there are trailers that have full-timers.... but they are near the front.
The point of going there is to be near the river.... not up front. They are however very clean as I remember.
I don't remember the Bathroom conditions NOR do I recall seeing any "Tweekers". I do think that had the bathrooms been as bad as suggested that I would remember that. (We use our Trailer bathroom for convenience though).
I'm going to chalk his review up to being (possibly) a competitor from "a much better spot downstream".
Look up Yelp reviews to see what people on average really think.