I think you're forgetting that public schools serve a purpose other than enriching the wealthy. I have such a hard time with takes like these. Would you have public schools turning away children that can't pay?
The 'well we have mandatory things already, so why not this also?' is what you are using to argue against the vaccine. I think a little nuanced thinking goes a long way when comparing all of the examples you proposed.
Microplastics include any fragment of plastic less than 5mm in length, and nanoplastics (less than 100nm) are much smaller than would be visibly noticeable.