[KittenInABox]

I think you're using phrases like "sometimes" and "mostly" and "some blend of" to advocate for a position that fundamentally promotes toxic positivity.

I agree with certain aspects of what you say, such as that it's inappropriate to justify disgusting behavior (which I assume you mean assaulting/harming others) and attribute it purely to circumstance as a way of avoiding consequences. I however vehemently disagree with the notion that a healthy mind is a mind that ignores basic facts of reality, such as how much influence randomness and luck have on our quality of life.

There are going to be circumstances in which people's lives objectively suck in a way that isn't their fault and they can still be optimistic about it in a way that acknowledges basic facts of one's living circumstances. There are going to be circumstances in which people's lives are objectively awesome in a way that they didn't do very much work to achieve and acknowledging that has nothing to do with whether or not they're an optimist.