Who he used to be doesn't matter. On this land, he is Thresh.
“I'm warning you, Doctor. Allowing an entity like Thresh to remain on Rhodes Island will only heighten the operators' tension and fear, which is detrimental to Rhodes Island's long-term development,” Kal'tsit declared sternly to the Doctor.
“But he can get me three stars.”
“Thresh could also attract unwanted attention from the nations of Terra.”
“But he can carry me through Contingency Contract.”
“He may even have some murky connection to Theresa's death.”
“But he's so fun to use in roguelike mode.”
Watching the “Doctor” stand there with such righteous indignation, Kal'tsit sighed. Better make him lose his memory one more time...
(Note: To avoid controversy, the protagonist is not the original Thresh. This is about an ordinary person becoming Thresh, struggling and changing, and gradually becoming more like him, though he is by no means a good person.)