"Facebook employees hired to moderate news and discussion on the site have recently reported being 'ground down', 'numbed' and 'traumatised' by the extreme material their job requires them to review with the low pay. Job has left some 'addicted' to extreme material and pushed others to far right by the amount of hate speech and fake news they read every day."

what is main ethical arguments for and against employers having an obligation to keep workers safe at work?