I think that because of what steemit is, is why they do not shut down accounts.
Is there an Etiquette Guide for Steemit?
There are no official rules for participating on Steemit.com, but one of the users @thecryptofiend has created an Etiquette Guide for the community. While it is not required to follow the suggestions in the guide, they are standards that many users in the community choose to follow.
There simply are no official rules. Also in the FAQ it reminds people that:
Accounts can not be deactivated or deleted. The account along with all of its activity is permanently stored in the blockchain.
I know with the normal safety that people expect for others taking care of us that this seems strange, but steemit really does mean that people need to own their mistakes and their actions. This in not Las Vegas where what happens there stays there. This is steemit, and it is open for the world to see, your actions good or bad.