You're grossly underestimating the prevalence of birth defects that lead to health issues in children.
And adults for that matter. (Any teacher who has a similar immuno-comrpomised situation, or knows of someone similarly immuno-compromised is at risk).
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In any case, I "don't worry" about the potential death of my niece at all. What I care about are the long term health effects on her and her life. And for the long-term health effects of other children too.
This disease has been shown to ravage and disable athletes: destroying their lung function even when they survive. Deaths are hardly endgame: long-term chronic illnesses are still a problem to try to minimize.
