Seasonal influenza mortality is roughly 0.1% historically.

Roughly 80% of the flu deaths occur in people who were um-immunized.

Depending on the strain of virus, the vaccine decreases the risk of getting the flu by 30-55%, which isn't anywhere the degree of protection anyone wishes for.

On the other hand, not getting immunized gives you zero protection.

The new corona virus mortality being reported is 2-2.4%; but this does not account for what are presumed to be asymptomatic infections, which would lower the mortality rate, or whether the publicly reported cases and number of deaths in China is reliable, which could shift the mortality rate up or down.

The mortality rate of the 1918 Spanish Flu is estimated at 10-20%.

SARS mortality rate was just under 10%.

MERS mortality rate is 30-40%.