What else do we have to do? People will sit around on Earth squabbling over it's control and resources whether or not we send out colonies to squabble over control and resources on other planets as well.
Lawyers don't bring any claims on their own. They don't create legal issues that didn't exist.
Unless they see they can make more gaming the system than facilitating it
"Open the pod bay doors, HAL." -- Dave Bowman, 2001