I rationalize it as becoming more active in human rights issues after realizing their importance first hand but based on my externally observable behaviour the PTSD explanation could be considered just as valid... and to at least some degree also rings true to me.
So I would say that there is indeed a good chance that a lot of these are caused by PTSD related to previous 'similar' workplace incidents and that indeed preventing those original events will go a long way towards calming the current storm of outrage. Not that I have the slightest clue as to how to do that though...