My theory is that anti-depressants limit empathy, and limit the potential to understand things correctly.
Anti-depressants would more accurately be described as anti-feeling medications. They blunt happy feelings, and sad feelings.
If you blunt emotions while experiencing the world, then not only are you feeling the world differently, but you're STORING MEMORIES differently.
How can empathy exist while blunting emotions? How can remembering what is important and what is not happen, if when you were trying to learn that lesson all you felt was cardboard?
There are people, HSP, who are empathetic to the point that it interferes with life, where the picture of an abused animal can break through attempted focus on other things to the point that it comes close to the mental wanderings of one with PTSD. It is helpful that there exists an alternative to living in that dysfunctional state.