... SCREW YOU, DOC! You swore the Hippocratic oath, "Do no harm." Yet you willingly do harm by ignoring people. Some doc you are.
As for Mamari, she has a history. If she loves the orphanage director like a daughter to father and it was the doc that made Pit Viper and Mamari is just a poor sap accomplice, then the director needs to be looked at.
@kavinh
If they follow the pattern of "Problem, reaction, solution" then the old man would want to keep it up.
You hand out the poison, they start dying, then you hand out the antidote, for a price, is a classic tactic taken by madmen.