I agree that Weltschmerz became this sort of ... tool to put yourself above others or maybe to strengthen self-esteem, as it includes pursuit of noble cause (fixing the world - let's put the question if it is necessary aside).
There could be a case that nihilism is blooming as a consequence (but it as well may be a cause) - it also points into alleged meaninglessness of everything (plus consequences of that - pain and suffering).
Sadly, I think it is misunderstanding, but what a fatal one it is - we are set in biological frame as I was writing in my posts, therefore we have a definition and from that - meaning. It may be a trivial one, but it does not downgrades its importance.

About the pain - I'm not saying it is bad, quite opposite, but actively looking for it would be a little bit of overdo as it can easily find you on its own.

Also, it would seem to me that you have quite different definition of suffering, as you described it as fixed reaction - blaming yourself, blade, circumstances and so on, while I see it as a plain of possible reactions (which you for example learned or had in you from biological structure) and it is those that bring you one of the outcomes.
Therefore, it is possible (in fact quite common) to learn "bad" reactions - and that would be what you described, unnecessary blaming, complaining and so on. That's why I said suffering is needed - to avoid this spiral of "bad" reactions you have to be exposed to it - otherwise you can't correct your habits.

About the tragedy - it seems to me again like you have a different definition - for me tragedy is similar to ... overall assessment of life, therefore it is more like 0 or 1. You either think life is a tragedy or you not.
Plus, your definition is exactly what I make out of suffering - "... is not overall avoidable..." and "what one makes out of [...] experience"
It is those experiences that define your sense of "tragedy".

I'm glad you enjoyed my scribbles, I hope you are having nice day =3