Deleting data after the purpose for which it was collected is fulfilled is one of the hardest actions to execute in data governance.
From the Blog on deletion
My photo was in an Ikea display once, but I could not walk in and remove the picture. Photos travel, they always have. Digital has sped up the ease of it.
Regret. Being human means we experience it in our lives. When was the last time we checked with people if they had regretted sharing any data with us.
Just because it is unintentionally does not mean we are not responsible. Want to reduce harm? Collect less data and delete the data we collect.