I think the real truth is that the minority who don't vaccinate ARE getting a free ride off the herd immunity.
The majority vaccinates, thereby suppressing the childhood / developmental diseases at whatever cost to themselves (which I think is significant), and also artificially reducing exposure to the unvaccinated.
In the nineteenth century the infant mortality rate was so much higher that it may be significant even once you have factored out sanitation, neglect, antibiotics, poverty etc. The fact is people got ill in a different way: there was a high prevalence of infectious disease from which you either recovered (and were stronger as a result) or died.
Many many died. With vaccination we have averaged the risk like we do with car insurance. The 'premium' is increased prevalence of major chronic disease and possibly increased mental illness (23% of Brits suffered mental health problems in Britain last year with a similar percentage on the verge - Affluenza, Oliver James).
Also I suppose that if you are a minimum interventionist, if child's tempreture gets really high, say 105F for an otherwise healthy infant, then that anti-pyretic is going to be all the more effective, likewise with antibiotics, (though not with antivirals they are mostly useless). No question about it - the full armoury of modern medicine intelligently applied can solve an awful lot of problems, enough for me to say 'Cure is better than Prevention' if the alternative is pumping chemical toxins into DD.