mount a sufficiently protective immune response no matter how much we vaccinate them--
It is the above who are put at risk when the majority of children (and adults) are not vaccinated. This is especially true for measles, where immunity approaching 95% or higher is necessary to prevent outbreaks. Soon, we may be seeing a resurgence of German measles (i.e., rubella)--likewise part of the MMR vaccine--and which can result in congenital defects in as many as 90% of babies born to infected mothers. Many die.
And for pertussis (whooping cough?) it is the adults --the parents and grandparents typically--who have not received a recent vaccine, who are putting the youngest children (too young to vaccinate) into the hospital. Adults should be receiving tetanus every 10 years, and that tetanus should be part of a pertussis-containing vaccine (Tdap) to avoid this problem.
So, my point? It is not just the families who don't vaccinate who suffer. This is why individual "choice" is not a 'laudible' goal but a horrific tragedy-- just waiting to happen-- for society on the whole.