I back the skaters in this situation, although it will probably cause property owners to be a bit more strict in that city.
Skating public/private property that's not a park is always a weird one for me. Technically any time you're skating anything not specifically designed for it you're committing vandalism. Whether it be waxing a ledge, wheel marks, rails, etc. Skating a rail basically does the same damage as rolling up and scraping the paint off with a screwdriver. I never really thought about this when I was younger, but now sometimes when I'm skating a spot I'll think, "Damn, I'm just rolling up on some guy's bench at his business and fucking it up." That said, skating's rad so fuck it.