Deterrents

General prosperity and satisfaction are the best deterrents to revolution.

Crewed expeditions in deep space may be a long time from now, if ever. Zero-gravity conditions and space radiation are deterrents, not to mention the psychological trauma of isolation in outer space and the exorbitant cost financially. The pioneers would have to be fit soldiers.

Cold and darkness are no deterrents for him.

Conversely, police and security officials say even when cameras do not always prevent crimes, they can be deterrents and aid in catching those who commit them.