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Personally, if I wanted to try and discredit vaccine testing, I would have gone with the Yellow Fever military vaccination program. That would have at least required some lengthy discussion around how the military mishandled the situation and why it doesn't apply to today. Guillain-Barré syndrome is a much easier question to field.

"In 1976, there was a small increased risk of GBS after swine flu vaccination, which was a special flu vaccine for a potential pandemic strain of flu virus. The National Academy of Medicine, formerly known as Institute of Medicine, conducted a scientific review of this issue in 2003 and found that people who received the 1976 swine flu vaccine had an increased risk for developing GBS. The increased risk was approximately one additional case of GBS for every 100,000 people who got the swine flu vaccine. Scientists have several theories about the cause, but the exact reason for this link remains unknown.

There have been several studies of the risk of GBS after flu vaccine and CDC monitors for GBS during each flu season. The data on an association between seasonal influenza vaccine and GBS have been variable from season-to-season. When there has been an increased risk, it has consistently been in the range of 1-2 additional GBS cases per million flu vaccine doses administered.

Studies suggest that it is more likely that a person will get GBS after getting the flu than after vaccination. It is important to keep in mind that severe illness and death are associated with flu, and getting vaccinated is the best way to prevent flu infection and its complications. Source

0.001% of people had a bad side effect to one vaccine 44 years ago. A vaccine that saved many thousands of lives. If that's the worst thing one can find on vaccines, that should be enough to convince anyone that they're quite safe indeed!