Trillian, why do I vaccinate?
I did an assignment about vaccination for micro-biology many years ago. All the anti-vaccination material I found was really poorly referenced and researched and had what I call circular referencing (A references B's work, B references C's work, C references A & B's work, D references A & C's work - there is little new information just a bunch of people referencing each other). Finding any peer reviewed research with a large cohort was pretty much impossible. Basically just bad science and poor research.
When I traveled in Vietnam I met people who had had polio - no way in hell do I want that for my children.
When I was a child one of our sheep had tetanus. It's something that you don't forget in a hurry and I would rather the risks of the vaccination to seeing my children going through something like that.

I'm not convinced that there is any need for MMR vaccination and I wouldn't bother with flu vaccinations but I suspect that in many cases if people realised just how awful some of the diseases we vaccinate are that they wouldn't hesitate to vaccinate - we're lucky we live in a country where polio survivors are pretty much invisible (there are still people in their 50's and 60's who have lived almost their entire lives in iron lungs) and diptheria is rare. I hope that any grandchildren I have are grow up in such a disease free society.

I think it's kind of hard to discuss why I vaccinate without scaremongering because frankly the diseases I want my to have increased immunity against are very scary.

Personally I don't care if people chose to vaccinate their own children or not - last time I checked informed consent was still an important concept in medicine.