How do you know that we can't? ;-) But you are right I do not know why exactly it is a space station we landed on or why we are not on the island anymore.
It's comfortable until you lose a lot of people. And you will. The station is fully functioning. Food and everything else is provided for. If you know how to use a spaceship, you might be able to just snatch some of the ones here. Most people just stay here though. Occasionally, there are portals opening to different places which can be nice. Often they have a connection to someone's home world. A lot of the time random stuff happens, people forgetting things or waking up in a different body or so... The nasty stuff has dialled down since we killed him though.