Actually we do know a lot about it. It's clear how it attacks the lungs, who is most vulnerable to it and we have data to back that up. The CDC website is free, take a look. The fatality profile of this disease is quite similar to other respiratory diseases.
The true fatality rates won't be known until we have a better grasp of the total number of people infected. (more complete data, which was my initial point). But it's clear that the expected mortality rate is dropping the more we know about how broadly it's been spread, and that's expected to continue.
It's not an opinion, not a political view and not driven by emotion. It's data. Have a nice evening.