The vaccine must be obligated at least for the childrens, because the children are weaker and can catch many diseases that can kill them. And if they don´t vaccinate young children and die there will be fewer people in the world. However, adults can choose whether or not to get vaccinated against diseasses. But for children, it has to be compulsory. The bad thing is that there are important vaccines that are not free and many people with money can be saved. If i more free vaccines everything would be better.