It's not "someone else's stuff," it's the city's. The non-profit "manages" the park, but they don't own it. An anology might be that you let a friend watch ove

It's not "someone else's stuff," it's the city's. The non-profit "manages" the park, but they don't own it. An anology might be that you let a friend watch over a cabin in the woods in exchange for letting you use it for parties and stuff. Now you don't people to use the cabin for a while (perhaps wildfire season or bears spotted very close by), people still keep using the cabin, so you change the locks. Still arguably a dick move depending on the dynamic of the park and skaters and what have you, but well within the city's rights. The only "damage" was to their own property.