There's nothing unscientific about pointing out the obvious -- only people with compromised immune systems are vulnerable to the virus since by definition a healthy immune response is clearly responsible for the recovery of the vast majority of people who have contracted the virus. Put simply, if you are healthy, you recover. If not, you succumb and die. I don't see anything unscientific or unsubstantiated with that statement, as it is a statement of reality and fact.

Furthermore, just because someone is not visibly sick, obese or old-aged at the time they contract this virus does not make them "healthy", though our sick-care system would obviously label them as such. The vast majority of people in this country have no idea how to take care of themselves and are not healthy. They live a sedentary lifestyle (i.e. don't exercise in any meaningful way), eat garbage (fast food, processed food, sugar drinks), and smoke or drink alcohol, all of which dramatically reduces immune system effectiveness and makes them vulnerable to the virus.