You should always inform others of safety hazards.
John is on a construction site with a couple of his coworkers working.
John wants to hurry and get home to watch the game.
John sees the loose beam and calls the safety men to come take a look at it then he heads home and watches the game.
John sees there is a loose beam that looks unsecured but decides to ignore it and heads home and watches the game.
The beam gets fixed and nobody gets hurt.
The beam falls and hits Johns coworker in the head his coworker loses partial eyesight and can no longer work.