"...nullify his stake..."

This is factually incorrect. They could have nullified it, sending it to @null, but that is not what they did. Please do not repeat inaccurate misinformation. They set it so that it could not vote for witnesses, be sold, or transferred.

"...the only time we can intervene is base on the terms of the agreement upon sale of the property."

Which is what the witnesses did. Tron had purchased the founder's stake, which has never been used to vote for witnesses, and has consistently been claimed by Stinc, @ned, and @dantheman, to be earmarked for development, and used for that purpose since Steem began.

Tron began publishing articles stating Steem was going to 'migrate' onto Tron, Steem was going to be exchanged for a new token, and if stakeholders didn't undertake the exchange in a timely manner, they could lose all their money. Things like that indicated that Tron was going to do things with that stake like simply take over Steem.

Which is exactly what Tron did. All of Tron's 'witnesses' are just bots on one box. If anything happens to that box, wherever it is, the blockchain could crash, or worse. For days now I have watched the price feeds from the Tron puppets and our consensus witnesses. The real witnesses are updating the price feed, which is damn important. The Tron witnesses haven't yet since they were imposed.

Tron does not have the expertise to control Steem and keep the blockchain working, and Justin Sun has stated 'I just want to sell my Steem for profit.' Since he has ~100M Steem to sell, what do you think him dumping Steem on the market would do to the price?

Don't defend Sun or Tron in this matter. His actions have been despicable, and that's without even mentioning convincing exchanges to steal their customer's money and use it to vote for Tron.