Generally, having enough humility to recognize that you might be wrong, and enough compassion to care about the little guy would go a long way. For example, th

Generally, having enough humility to recognize that you might be wrong, and enough compassion to care about the little guy would go a long way. For example, they could notify the owner of the account after deleting it. And allow them to download their data. It's not hard to do, it does not open them up to social engineering, and it does not incur per-customer cost. Nor does it facilitate continuation of spam, in fact it hits legitimate users way more than spammers - spammers bought their lists and have copies, while users who legitimately grow their lists through sign ups usually don't make copies.