Line Clearance is hard work, sometimes in harsh conditions, so it's not for everyone. There are many jobs out there that are physically easier and much less dangerous. Thus, there's a high turn-over rate.
Policies are designed to divert the responsibility of any incident to the foreman or groundsperson. Riggs is exemplary in 'company lawsuit prevention', so if something goes wrong, expect to accept repercussions. Management seems more concerned about wheel chocks and caution sign placement (lawsuit prevention) than your own personal safety.