How would you care more when the same person (here same account) is telling you to make a change in the deal? If there was no hack involved we would not see the scam. The situation was real tricky and anyone would have been victim of it. MJ did not keep the money after all.
I disagree. It was MJ's responsibility to ensure a safe transaction and being a presumably experienced trader and escrow he should have been able to see the red flags. Granted we're looking at this with the benefit of hindsight but it's a lot of money to be so careless about.
Maybe a better solution would have been to refund the buyer if anything changes. If they agree to meet in person instead of shipping, that requires a new agreement in which buyer has to fund escrow again to a new address. But that requires strict rules from the escrow, known upfront, which wasn't the case here.
If the delivery is in-person you don't need escrow.