Public land? Rotfl. You just showed how ignorant you are of this situation.
1) it very plainly is NOT public land. Its a privatly owned and run community pool.
This is a community pool? Looks like roads/pavements/grass on a housing estate to me. You have weird looking community pools in the US
2) disturbing the piece and public land are not mutually exclusive. People are arrested all the time for distubing the peace on both public and PRIVATE property. Owning the land does not give you the right to disturb the peace on it. They clearly were breaking the law as house parties for decades have done. They get shut down all the time. Nobody cries.
1) You should learn to spell basic words before you patronise me like I'm some kind of idiot.
2) I never mentioned a connection between "disturbing the piece" [sic] and location, you made that up. Pointless strawman.