In case you didn't notice, the over-reaction (including shutdowns) caused the stock market to rise significantly during the first two years of the pandemic so the opposite of your comment actually happened.
Having kids wear masks in school is exactly helping part of the most vulnerable group.
You know who spreads more germs? Fucking kids. You know where large groups of people who are good at spreading germs and often times have nothing else in common outside of that place? Grade schools. A descent population of elementary school teachers are in the upper age ranges.
Grandparents (group in vulnerable range) often take kids to school/pickup and help take care of the children.
So you really need to stop and think what in the hell you are saying acting like elementary school kids should not have been wearing masks.
Outside of institutional investors, most old people are the most invested in the markets compared to young people so they have an interest in seeing the market go up.