I wouId argue that toxic positivity has its roots both in Anglo-Saxon liberal capitalism and in the New Thought movement: https://en.wikipedia.org/wiki/New_Thought
Distinguishing between optimism and hope is a useful exercise in this context. I think Barbara Ehrenreich wrote about this in a book I have yet to read, "Bright-sided: How Positive Thinking Is Undermining America".
What makes ‘toxic positivity’ different from a healthy attitude | Psyche Ideas
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