Being a mathematician, I take a calculated approach to many aspects of my life and life of my children. When it comes to vaccination it boils down to calculating the risks of being seriously affected by vaccinating or not vaccinating my child. Purely from this point of view, we decided to vaccinate our children from major diseases and don't bother having chicken pox or flu vaccines. This way the high risks are averted and we are ready to accept and deal with lower risks.
I must admit, when majority of children around you are vaccinated, the risk of your kid becoming ill is very small. It is much higher risk if most of the kids are not vaccinated and everybody becomes ill much quicker. So, at this moment in time, when majority of children are vaccinated, vaccinating the kids is better for a "greater good" rather than for your own child.
Ultimately it's your decision.
Thanks for commenting. Your approach is logical and makes sense.