The younger people don't die or even feel sick, but they carry the virus around.
The older people feel sick after 10+ days.
This makes the virus dangerous.
If anyone got the virus die instantly, it actually makes the virus no chance to spread.
The question is that "Do these "cured" people still carry the virus?"
I see that a few posters are making fun the death rate is only 5%.
The current death rate is not important.
After everyone gets infected, the virus can evolve and kill more people.