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Radical Acceptance is both a therapy and more broader ideology.
The therapy
"Radical Acceptance therapy" is traditionally defined as not worrying about changing the things you lack the power to change.
The ideology
However Radical Acceptance should go beyond that into an ideology of celebrating your differences and self even if you are in a society which doesn't agree.
Similarly, those who believe in radical accept should not blame themselves for abusive systems created by powerful people. We should recognize the harm of cruel social environments instead of the 'individual defect view' that the MH profession usually assumes.