Yes, younger people are less at risk if they contract COVID-19, but regardless of the age group, the disease is riskier than the vaccine.-How much more likely it is depends on the age group; which is why we don´t give the vaccine to young children
-You are assuming that a person gets COVID19; it is not a given; future variants might be more difficult to dodge but they will probably be less dangerous
So whether somebody has to take it, remains an opinion. If I had a company to run I would fire those who do not take it. That´s also an opinion and should not be outlawed.
I am not assuming a person gets COVID-19. The risk of getting COVID-19, and also suffering severe effects from COVID-19, far outweigh any significant risks associated with the vaccine, regardless of age group.