This is irresponsible to the trained personnel. We have job safety requirements for people working on assembly lines. We should also have psychological safety for people, and there are lots of stories of employees that are paid to view the toxic videos suffering (even developing PTSD).
So we shouldn't allow jobs which may expose employees to psychologically harmful experiences? You realize you'd have to outlaw a whole slew of professions, right? If you can't take it then don't work the job, Yeesh.