Sati was performed by those Hindu women who can't bear the pain of separation from her beloved husband. Sure family can prevent this but if she is determine to follow her husband after deeth of body, she is allowed to perform Sati. We believe that soul can't die.

They will unite after this deeth.
Rmbr, Sati is not just embracing fire with ded body of husband. No one shd force any woman to follow this. No one shd plant the idea in brain of woman to follow this. No one shd guilt trip any hindu woman to follow this. It was done voluntarily.