To be honest not vaccinating has become a weird debate in western society and I think it's because most of teh really dangerous diseases have died out or have practically died out so everyone think why bother? There are now recurring epidemics of certain diseases that were rare because of vaccination, there was mumps in Scotland, whooping cough in Britain and TB in France. The last two caused multiple deaths.
In other countries where vaccination is less common, the rates of infant deaths from PREVENTABLE illnesses ae much higher. Measels often wipes out whole groups of children or if it doesn't kill them it maims them permanently. Polio is the same it should have been eradicated but there have been backlashes in certain communities notably at the moment in Northern Smurfia and Pakistan where Polio vaccinators have been killed because tehy believe that it is a western conspiracy to sterilise their kids.
The reason that we in the west can have the debate about whether or not to vaccinate is due to the fact that vaccinations have helped reduce preventable diseases to the point where we are less threatened by them. Not all vaccines have adverse reactions the BCG and measles vaccines help stimulate the immune system, wheras dtp and hep b can have adverse effects especially for girls.
I am def pro vaccination, although for example the flu and chicken pox vaccines are pointless in my opinion but the major vaccines are I believe important for protecting my child and other children. Measles vaccine is only effective if 90% of the population is vaccinated, otherwise it can still spread extremely quickly.