Letting people know where and how the vaccines are cultured is also a good thing to know.
For example, when my MIL (a staunch catholic) made a negative comment for not vaccinating DS, I responded; "did you know that numerous vaccine viruses are cultured using the cell lines from aborted and discarded human fetuses?" Needless to say, that shut her up good and proper. Little did she know that she had been indirectly supporting something that she believes so strongly against!!!! I told her that if she's interested in finding out more, I have a whole army of unpleasant truths stuck up my sleeve!!
Just to clarify this point (for reader's here, not for the MIL).

Human cell line cultures are used to produce the rubella vaccine virus that is used in MMR and single rubella vaccine. "Some of these cell lines originated from aborted fetal tissue, obtained from legal abortions in the 1960's. No new fetal tissue is needed to produce cell lines to make these vaccines, now or in the future. Fetal tissue is not used to produce vaccines; cell lines generated from a single fetal tissue source are used; vaccine manufacturers obtain human cell lines from FDA-certified cell banks. After processing, very little, if any, of that tissue remains in the vaccine."

Cell lines are self sustaining. As long as they are at the right temperature, and given the right food, they keep splitting and are able to keep growing and growing. So, the original cell may have come from an aborted fetus, but they don't need to keep getting tissue from fetuses in order to continue making the vaccine.