Because no vaccine is wholly effective especially amongst those with a reduced immune response such as the sick and elderly. The more people who are vaccinated the less chance those for whom vaccination is not effective have of avoiding the disease.
Not being vaccinated would also be a selfish act. You would be benefiting from the acts of others in creating a lower risk ito yourself by virtue of paricipation in a vaccination program whilst at the same time not contributing toward creating lthat lower risk yourself.
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