Keddiay,
No offence but don't you realize these two facts? That:
1. All vaccines are claimed by the pharmaceutical companies to be effective for a few years only (eg. 5 years for mumps, 20 years for measles), and
2. Virtually no adults in Singapore get booster shots.
Given the two facts above, and using your logic, you should realize that
99.99% of adults around you will pose exactly the same threat as posed by unvaccinated kids. To stay true to your logic you should also ask adults to stay away from children who can't vaccinate too.
I find it funny that the mainstream media (and the people brainwashed by it) could not rationalize the two facts to support their version of "herd immunity". If you can build your logic around them do share with us.
Here is my version of herd immunity:
1. Herd immunity is valid only when it is applied to natural immunity. Natural immunity is gotten when exposed to wild virus in a natural way (eg. through the mucous system) and will last for life.
2. As more people get natural immunity an increasing percentage of the population will have immunity and it will protect the "children with cancer, immunocompromises, premature". This is
impossible to be achieved by vaccinations because vaccine efficacy WILL WANE and very few people take booster shots.
Disclaimer:
The text above was written using your premise that vaccines do confer immunity. I think that this is yet to be proven. The reasons are:
1. Vaccine studies are always conducted against the vaccine-strain of the virus. They never use wild-strain of the disease. We know strains of virus could be very different from each other.
2. Vaccine studies use the level of antibodies to determine its efficacy. However there is no proof that this is a reliable mean of determining efficacy. Scientists have found that i) People with a genetic disease making them unable to produce antibodies can cure themselves of diseases the same duration as normal people, ii) People with high antibody titer can still get a disease. This page has a good compilation of articles on this:
http://www.whale.to/vaccines/antibody.html
3. Read up on Original Antigenic Sin. Basically scientists found that our body remembers forever the first mode of exposure to a virus so as to tune its defenses against it in the future. They found that Measles-vaccinated people (exposure through injection/blood) when exposure through the mucous system have higher severity and longer duration of the disease because the body was looking at the wrong place.
4. Also read up the baboon pertussis study (google baboon pertussis). It shows that vaccination does not prevent baboons from being infected (they become silent carriers) and they can in turn infect other baboons.