If someone self harmed to avoid work that tells us alot of their mental state and how they see the world and how they will recall events. I.E. how reasonable their perception of the world is.
I'm not saying they are wrong, but it is the framework reasonable people will have to use when investigating the incidents. At this point the Canadian equilivent of a labor board must look into it.
Self harm is an extreme thing to do, which tells us this is an extreme personality.
If you ever feel the need to self harm to avoid a situation at work, please seek immediate help, both through the labor board, and from family and friends. Use your nextwork to immediately exit the situation.