Read my original answer before it get burried here:
I do understand that taking into account the emergency in all the world and the threat for some elderly and vulnerable people, they are helping many people for whom it is less the risk of the vaccine than of the virus; but making mandatory for all, young and children with a near zero risk of dying from Covid included, without knowing the side-efects in the mid-long term, is just insane to me.
My previous answer has information about side effects and in this post, I want to reiterate the need why as many people need to be vaccinated, even those with a lower risk.
First of all, I'm not aware of near-zero risk groups. Even in young people, there can be a form of brain damage. COVID-19 can cause strokes, seizures and Guillain-Barre syndrome — a condition that causes temporary paralysis. COVID-19 may also increase the risk of developing Parkinson's disease and Alzheimer's disease. Some adults and children experience multisystem inflammatory syndrome after they have had COVID-19. In this condition, some organs and tissues become severely inflamed.
https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-long-term-effects/art-20490351There are several reasons for the need to vaccinate as many people as possible, but the main reason is that vaccines, including Covid vaccines, are not magical potions that put a holly shield around you. They train your immune system to recognize certain proteins. If a virus mutates into new variants that use different proteins - your immune system may not be able to recognize them.
If half of the population is unvaccinated, they may cultivate new variants that will start infecting vaccinated people and all the efforts to combat the pandemic will be in vain.