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It's not the account which you have to secure. The owner of the account has to be secure as well. Ever heard of extortion?

Scenario, corrupt law enforcement matches an account with a flesh and blood identity. Then one of the agents demand a donation to a cause which makes their lives easier or else...

If you're that worried (as in you're that wealthy and in a position that could make you that much of a target) then you could filter the steem power setting it up on multiple accounts that are very difficult to lead directly back to you.