Nemaste, again you make a good point. Since 1980, the only cases of polio in the US were due to the oral polio vaccine (a live virus vaccine). About one in 3 million doses of the oral vaccine mutates or reverts to a form which causes actual polio. This was causing 8-9 cases yearly, so by 2000 the CDC mandated to give the inactive polio vaccine instead.
Everything is weighed in terms of risk vs benefit. In the 1950s, during the polio epidemic, tens of thousands of people were being infected each year in the US alone. That is why it was felt that the risk of causing 8-9 cases of vaccine induced polio was worth protecting the entire population. By 2000, it became obvious that the oral vaccine needed to be replaced, because it was probably causing more cases than it was preventing.
Again, mercury is a potent neurotoxin, and I would never defend its use as a preservative for pediatric vaccines (even though there are no convincing studies to prove it is harmful in the doses that were used)--it just goes against common sense.
I don't have alot of technical data on vaccines, but I know enough about modern medical practice (especially in my small town--we get all the C students) that my kids aren't vaccinated. I homeschooled the last three and taught them rules about hygeine in public places. Worked out O.K. I'm glad we can have differant ideas here and share them respectfully.