To be honest, I think the parents were being unnecessarily paranoid. Even the most average keeper is unlikely to accidentally let them escape or be stung if just a few basic precautions are taken.
The risk about scorpions escaping and establishing feral populations is incredibly low, even when the native and exotic habitats are both compatible for its survival (deathstalkers are NOT suited to Malaysia -- try imagining an Heterometrus sp. surviving in Egypt).
Scorpions are K-selected species, meaning that they have a slow generation time. You would have to have many escape, and it would take years for any population to begin to establish, assuming the founders survived long enough to breed (which would be all but impossible in that habitat).
As far as "breeding a species where it didn't occur naturally" goes, I feel that practice is the duty of responsible hobbyists everywhere.
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."