While most of the rest of your post draws a legitimate contrast between clinical depression and anguish etc caused by events, the above, and the idea that someone can physically assault another person for potentially misguided sympathy is a bit ridiculous. The reaction that one experiences to sympathy is itself a general (and perhaps cultural) issue and is not necessarily tied to the condition regarding which sympathy is expressed. It is a peculiarly modern notion, I believe, that such expressions of sympathy are interpreted/ perceived not in their symbolic sense but in a literal sense that should invoke hostility. Such expressions are insulting only if one chooses to privilege one's own suffering above that of others (whatever be their respective causes) or is particularly pedantic in parsing the syntax and ignoring the emotional content.
--ravi