Maybe someone's insta post is their critical part of their experience? Maybe they want to build cairns because they think they are beautiful. Who cares, it doesn't affect to environment as badly as a well traveled hiking trail with clear signage that attract lots of tourist who leave trash.

>but if not for that trail, it would actually be impacted more.

Or maybe it would impact it less by keeping tourists out. If it's about compromise, maybe we shouldn't call it Leave No Trace? That phrasing doesn't imply compromise, but it seems like every individual has their own ruleset when it comes to LNT, even though the wording is pretty absolute.