Our school has a mandatory safety training before students go on internships, and the reason for that is that interns have died in the past. A lot of things can be dangerous at work (including ladders) and not everybody is familiar with the associated hazards. Ladders, compressed air, electricity, machinery, confined spaces, chemicals, dust, and so on are all things that are dangerous, and the fact that they injure or kill people every year even though they're known hazards is a testament that people are too complacent around them.