Performative allyship is the intention to show solidarity for a person or group without taking any action to do so. It is harmful because it makes people think that they're in a safe environment when they are actually not. Performative allies self-indulge to reduce guilt or attract attention, and don't have a vested interest in the freedom of people from marginalization.
Performative Allyship is Deadly: https://forge.medium.com/performative-allyship-is-deadly-c900645d9f1f
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