Boycotts have worked in the past. The one that comes to mind in the recent past was a boycott against Arizona because of it's "papers please" law.
First conventions are canceled, then people change their vacation destinations, then companies change their relocation plans, and on and on. When states get hit in the pocketbook, they might rethink their laws.
These entertainers are using the only platform they have to draw attention to a cause they consider important.
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