Credit? They only acted because they had to. Doctors were arrested weeks before for "spreading rumors". Their inability to act has led to this thing spreading beyond their borders.
Would this quarantine happen in your country or any Western country? I doubt it.
Not arrested. They were given a warning and asked to sign a sort of declaration that they agreed what they said were wrong then were sent to home. Still bad but not the same as being arrested.
Compared to their idiotic response to SARS this is at least better.