The full name is "severe acute respiratory syndrome coronavirus 2".
It is not mild, nor has it ever been. They don't call it MARS-CoV-2. It would be a very confusing name anyways because we live on Earth, not Mars, btw. And I don't think the Martians would appreciate being unluckily associated with this virus.
I disagree, this is exactly the correct level of reasoning for the people that would argue against the correct conclusion. In real life, at least.