The suspicions might turn out to be remarkaly unhealthy.
FWIW, I've never had a flu shot and don't plan on getting this one.
There is a very long list of diseases that have been essentially wiped out by vaccination, from polio to smallpox. Every one of those vaccinations had a small number of bad reactions, with everything from people paralyzed for life to dead.
But out of 1M people vaccinated, isn't 100 to 500 people with bad reactions preferable to 10,000 to 100,000 dead?
It has been credibly proposed that a contributing factor in the success of the American Revolution was that Washington innoculated the American Army with smallpox. This isn't a vaccination. Innoculation gave the person smallpox, but generally a milder case. The mortality rate was around 2% instead of at least 15% to 20%.
The British Army did not vaccinate and had several major outbreaks of virulent smallpox, especially among slaves who fled their plantations to join up for the promise of freedom.
The differential rate for vaccination is much greater.