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The mercury in vaccine issue is very similar to the global warming issue in one way.

Mercury in vaccine has never been proven to cause any harm. Specifically, when you compare rates of autism in countries with thimerosal (mercury-based preservative) in their vaccine versus autism rates in countries with mercury-free vaccines, there is no relation between mercury exposure through vaccines and the autism rate. When you compare the autism rates over time before and after mercury has been removed from vaccines in a given country, there is no decrease in the autism rate. However mercury is known to be highly toxic and because some of the effects of mercury may be long-term effects which are not easily measured or observed, it is only sensible to avoid mercury in vaccines when there are less toxic alternatives.

Similarly there has been no proof that greenhouse gases cause global warming. However common sense tells us to minimize the amount of pollutants we are dumping into the atmosphere.

Two different issues, same theme, same conclusion. Avoid what is toxic if we have alternatives.