People under 50 and healthy probably aren't a majority of the population. You can probably get away with 'mostly healthy', but there's enough people under 50 t

People under 50 and healthy probably aren't a majority of the population. You can probably get away with 'mostly healthy', but there's enough people under 50 that are overweight to make it so that more than half the country is either over 50 or has a co-morbidity. And then there's lots of other things that are impacting people's health. If you called the mRNA vaccines something else, the risk reward trade off wouldn't change, and there is nice clear evidence that they reduce overall risk for adults, even relatively health adults. The trade off is tighter for younger males, but it also slightly favors vaccination (the number of serious adverse events due to vaccination is smaller than the number of infections requiring hospitalization).