This sentence alone is true, but it misses the fact that a) young children suffer from this disease too, b) these young children live with older people that are at more at risk, hence they can bring something back from their schools that may cost the lives of their parents (I don't think losing your parents when you're a kid is great for your development), and c) there's always the risk of more deadly variants emerging due to more transmission.
> [...] individuals should have a role in deciding what's right for them.
For matters that only concern them, yes. For matters of public health, where you can transmit something to others without their consent and potentially cause their death or long-term disability, no, you don't have that luxury. None of us do. Same reason why a single nation can't/shouldn't just pollute all the seas and cause tons of greenhouse gas emissions and kill the world for everyone. We may not like it but we [have to] live together and being in a society means looking out for each other.
You are free to not wear a mask or party by yourself, in your house, away from society.