There's a reason we're called loopers. When we sign up for this job, taking out the future's garbage, we also agree to a very specific proviso. Time travel in the future is so illegal, that when our employers want to close our contracts, they'll also want to erase any trace of their relationship with us ever existing. So if we're still alive 30 years from now, they'll find our older self, zap him back to us, and we'll kill him like any other job. This is called closing your loop. Eh, you get a golden payday, you get a handshake, and you get released from your contract. Enjoy the next 30 years. This job doesn't tend to attract the most forward-thinking people.