不是你说的那样。这事不是非黑既白的。还是日本的例子：

 

日本人不信，后果很严重。

In 1993 the MMR vaccine was withdrawn in Japan due to high rates of aseptic meningitis from the mumps component. This was followed in 1994 by removal of the vaccine requirements to attend school. The result? A marked increase vaccine-preventable illness. 11,991 cases of rubella in the first six months of 2013 with 10 cases of congenital rubella. 76% of cases were in the unvaccinated. For comparison:

2004–2012, 79 cases of rubella and six cases of CRS were reported in the United States; all of the cases were import-associated or from unknown sources.

 

100%-76%=24%，接种了疫苗的人

 

从这个例子可以看出来，疫苗可以增加人体对病毒的抵抗力，但不是百分之百的刀枪不入。
预防疾病大规模传播，是所有公民的责任和义务。