Bodyguard
1) Buisnessmen, politics and other important person.
2) Yes it is. You can be killed by a killer.
3) Bodyguards protect their employers.
Vets
1)Yes it is. In vet's hands animals's lifes.
2)Every responsible and benevolent man.
3)They have to learn about animals's anatomy and how to provide first aid.
Computer programmers
1)Yes it is. Computer programmers make web-sites, different programs and software.
2) Everyone, who knows the basics of programming.
3) Ответ на этот вопрос в первом вопросе.
Teachers
1) Because they teach people important knowledge.
2) Every responsible, kind, understanding and able to find a common language man.
3)For students, their knowledge and relationships among themselves.