The ones over seen believe
The risk of vaccine damage 1 in 1 million is significant
The risk of measles damage ie 1 in 5000 die, 1 in 4 are hospitalised, 1 in 15 left with long term complications such as deafness, is 'scaremongering' and wont happen to their kid because their kid is so healthy and has a fantastic immune system. Reality is it does hit vulnerable people harder but healthy kids can be affected too.
Still believe the autism link even though this has been disproved to death
Because most havent been exposed to measles they say it is a self limiting mild childhood illness that wont affect children with good diets. They think it was somehow worse in the days before vaccinations because children had poorer diets then
They are worried about chemicals in vaccines
Worried about unknown long term effects of vaccines (other than less death)
Think that deaths from disease is coincidental to introductions of vaccines due to improvements in living conditions and improved diet (ignoring that these would have had similar effects on all diseases at the same time, when in reality each disease dropped after introduction of the specific vaccine which were all at different times)
They think anecdotes and YouTube movies are 'proof' that vaccines are dangerous
In vaccine is 100pc effective at individual level and they see a story about someone who was vaccinated catching measles and think it doesnt work and there is no point (ignoring the fact you are 10x more likely to catch it if you are unvaccinated and it's likely to be much more severe)
At the extreme end they believe that the government are trying to kill their children eg limit population growth / 'big pharma' are trying to make everyone ill so they can sell them their drugs in later life / doctors make money from injecting patients (which has been disproved, they lose money). Conspiracy theories are hardest to argue against as when you point out facts from independent studies they will just say the study is fake / useless as ultimately funded by big pharma etc