According to common sense, Lin Feiyin's statement was not wrong. After all, doctors must be cautious with medication and must not randomly use something of unknown effects on patients.
However, considering the special period they were in, any method that could save people was acceptable. After the apocalypse, various strange things had emerged, some of which might contain the ability to suppress the zombie virus. Were they supposed to research such a thing thoroughly before using it? If that were the case, people would have died!
Before the apocalypse, the efficacy of various medications had become minimal due to changes in human bodies. Therefore, after the apocalypse, all researchers devoted themselves to finding new medicaments that could control the zombie virus and save lives.