N. Taleb wrote a very good note [1] on why conventional risk-benefit considerations don't apply in the case of an unknown contagion like NCov19 - the comparison to the seasonal flu is not helpful in these cases (thin-tailed risks vs fat-tailed risks which are an existential threat on a long-enough timeline).

[1] https://www.academia.edu/41743064/Systemic_Risk_of_Pandemic_...