From the Rope Swing Manifesto:

The absolutely best rope swing is one currently in use by your friends. If you approach a rope swing in use by persons not known to you, realize that you may get a cool reception or worse. As we’ve seen, rope swings usually occur on private land. The swings themselves, however, are private in a way more profound than matters of real estate, surveying, probate, and taxes. Prior use conveys ownership. While the other rope swing users are no doubt trespassers just like you, they may feel that they are the true keepers of the swing, and you are an interloper. They are right. As holders of local knowledge, and as people who have used the swing without getting caught in the past, they have every right to resent you, who by your very presence may call just enough attention to the swing to get it cut down.