they broke law nor contract, and that could be the main problem right there: why doesn't this behaviour break a contract or agreement, when so much Steem was delegated to them? Are such amounts of Steem delegated on good faith alone?
That is why I think it's reasonable to ask for transparency for delegations, and I would even go as far as a democratic system for it.
I confess my spine crawled at the very thought of democratic approval for delegations by independently held stakes.
While I do expect the delegations to be informed by this particular result, and due diligence to be more in evidence hereafter, and further, have called for whales to delegate to users they think will be 'good' for Steem and Steemit, I'm not, and have never been, interested in determining for them whom to delegate to.
I'll be happy to see them tend to their knitting.