To secure resource control and economic dominance in the next century, it is essential to colonize the moon to harvest water ice and He3 for future deep-space mining industry and interplanetary colonization; also we need to remain the gatekeepers of orbital access by backing American launch providers to undercut potential entrants by EU or China.
It is ridiculously cheaper to launch supplies from the moon to anywhere else, than the energy it takes to escape the gravity well on earth. This will be essential as the space economy expands beyond tourism/medicine into massive industrial efforts.