I would not define things black and white in this issue. The fact is that vaccines saved millions of lives. But there is other side of medal. The money. Farmaceutical companies in a pursuit for money surely don't take every possible research to make vaccine safe for everyone because it makes it very expensive. Other problem is also that often third world countries get vaccines with very badbqualizy on very high prices. But still, i think the vaccines are the best way to fight deseases so far. Vaccines and prevention of course