While you do touch on the mechanics of thought-feeling triggers there is a lot to be said for how a person gets to a depressive state as a result.

I think you are being reductive in how you’re separating people and how they experience these sorts of thoughts.

Bad thoughts and sadness exists but that doesn’t mean every person experiencing it depressed.

Many people can have those thoughts and feelings as you say but function every day and may pause on the thought and feeling connected to it but respond or react in their own learned way and may move onto other things. They might experience it many times in a day. But just cuz they don’t sit down and cry on the sidewalk about it doesn’t mean they aren’t experiencing these thoughts or feelings.

Calling them obliviously happy assumes and predicts a lot about them as if they cannot experience sadness. This assumption is synonymous to how a person with bpd will decide ‘no one can experience feelings as strongly as I do’ where they misplace where the issue lies at how they react to the feelings they have. Not that the feeling is any different. They are overwhelmed by the feeling for a lot of reasons but that does not mean other people they compare themselves to do not experience the same feelings (triggers) they do.

This just serves to alienate people for self preservation to hold onto an illness as unique and defining themselves by it.

we can all experience these thoughts and feelings therefore I do not believe triggers to what may lead to depression make the entire story. The thought might be there, and the feeling to kick it off but a person who is prone to depressive states move into a darker area after that.

Depression can be hereditary where you have people who are more predisposed to the physical and encompassing depressive states which can trigger some other compound issues such as addictive personality disorders.

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Thoughts are another topic into themselves. And there is many ways a person can react or respond to them.

The habits as you point out, to see most challenges as a personal jab at their own performance I believe so much of this is trained. Just as much as it can be untrained

https://outofthefog.website/what-not-to-do-1/2015/12/13/stinkin-thinkin-the-ten-forms-of-twisted-thinking

Comparing ourselves to others is pretty ingrained in society where we have bad habit sayings to reflect it more.

Eg: “be grateful you’re not that person”

Eg: reward and punishment system for teaching

Eg: using real life people as an example/idolizing

This teaches people to be in a constant competition with other people around them.

Then you have the people who just see that as a challenge regardless or don’t see it at all and capable to find joy and celebrate another persons success without a thought to their own performance. Whether it be from therapy or perhaps that is their predisposition. That doesn’t make them oblivious to the very thoughts and feelings that may be a trigger for someone else.