perhaps they are more advanced than us and planning on invading us. Maybe our customs and legal framework aren't ones which they are familiar with and thus fit their paridigm of terra nullius.
Maybe they have already learned how to harmonize their lives with their surroundings or learned effective ways of maintaining the balance that they dirsupt through their existence and we can learn something to preserve our own planet
Maybe they have a better system of governance and can show us how to best serve society in a harmonious manner
Or maybe they just want to eat us.
Some people can go their whole lives and never really live for a single minute.
