The climbers were roped together for 'safety'. = The climbers were roped together 'for safety's sake'.
There is 'safety in numbers'. [=you are safer in a group of people than you are when you are alone]
His hobbies act as a 'safety valve', relieving some of the pressure he feels from his job.
(..) And I think the honest people over there really appreciate it. Why wouldn't they? For the first time in their lives, they get to watch their children grow up. In an environment of safety and security. Let's go Kelly, can you hear me out there? Loud and clear Pat. I'm here in Sunny Tehran. (..)2014 RoboCop
(..) freedom abroad. This is standard Op alright, there is no opposition expected. I'm gonna set your markers to code red. All our drones are going to give top priority to your safety. No red assets have ever been lost. OK Does this make you feel better? But listen, keep those (..)2014 RoboCop