A potentially life-threatening disease can be mild. I'm not sure why you think your source is a gotcha argument? He sourced it in his second comment. However,

A potentially life-threatening disease can be mild. I'm not sure why you think your source is a gotcha argument? He sourced it in his second comment. However, due to the increase in cases, especially in young people, they aren't recommended to get vaccinated with Moderna for example. And younger children aren't recommended to get vaccinated at all right now, except when having pre-existing conditions (Germany, can't speak for other countries).