Why does Wanda turn evil?

Why does Wanda turn evil? There are no ethical motivations for the way they write Wanda’s villainy in this movie. Scarlet Witch loses her children and is a vengeful, mass-murdering mom that completely reverts to earlier stages of grief in WandaVision.

There are no ethical motivations for the way they write Wanda’s villainy in this movie. Scarlet Witch loses her children and is a vengeful, mass-murdering mom that completely reverts to earlier stages of grief in WandaVision.
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