For me personally it's giving back to the displaced because I was helped when I got here. I had nothing on me when I got here other than my phaser and Starfleet uniform. People who were displaced or locals who know about us gave me a job and a place to stay without asking questions. They did it because they didn't want to see me struggle on the street. So now that I can give back I do as repayment of what was done for me. Most other people who help do it for similar reasons.