I'm certainly not relying on other immunised kids to protect my kids, quite the opposite in fact.
We have friends that have just had the MMR..did you know, for example, that those kids wil now secrete the viruses from their noses?? This is how *wild measles* is passed on.
I'm not frightened of my kids getting ill, chinese medicine says that the high fever of measles gets rid of the toxins carried in the body to that point.
I dont know if its true, but for every thing with vaccinations, there is a counter argument.
Chicken pox vaccine lasts a max of 10 years. 2 of my kids have had the actual virus and now, (hopefully) have life long immunity. I'm not exactly looking forward to my other child and baby on the way to getting it, but I really see it as part of normal development.

I cant imagine ever vaccinating my kids, but they may choose to further down the line, and thats cool with me. I'm doing the best by my kids, as we all are. As long as we research and weigh it all up, I don think we can judge anyone for the decisions they make.